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Cast On Critical Strike Support

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Cast On Critical Strike SupportSupport, Spell, Trigger
Icon: &
Mana Multiplier: 140%
Can store 1 use(s)
Cooldown Time: 0.50 sec
Requires Level 38Must support both an attack skill and a spell skill to work. The attack skill will trigger a spell when it critically strikes an enemy. Cannot support totems, traps, or mines. Vaal skills and skills that reserve mana cannot be triggered.Per 1% Quality:
Supported Skills have 1% increased Critical Strike Chance
Supported Attacks will Trigger a Supported Spell when you Crit an Enemy
Supported Skills deal (20-39)% more Spell Damage
You cannot Cast Supported Triggerable Spells directly
This is a Support Gem. It does not grant a bonus to your character, but to skills in sockets connected to it. Place into an item socket connected to a socket containing the Active Skill Gem you wish to augment. Right click to remove from a socket.
Cast On Critical Strike Support inventory icon.png
Acquisition
Level: 38
Purchase Costs
Normal1x Orb of Alchemy
Sell Price
1x Scroll Fragment

Cast on Critical Strike (commonly referred to as CoC) is a support gem that causes linked spells to trigger when the player scores a critical strike with the attack skill it is linked to.

Skill functions and interactions

The chance to trigger is rolled separately for each enemy that received a critical strike, so it is possible to get multiple casts on one skill use if multiple enemies get hit.

In case of multiple spells linked to one attack skill this support will roll its chance to cast for each spell sequentially with 100% chance to cast when the hit crits, rolled once against the critical strike chance, and again against the accuracy rating to make sure it has hit. In the case of a hits can't be evaded modifier, this second roll is counted as 100%.

Cooldown Time: When a supported spell is successfully cast, it and all supported spells of the same name are put on cooldown for 500 milliseconds. This means that a given spell can only trigger once per critical strike, and reduces the effect of linking multiple copies of the same spell to this support (especially when it is at a higher gem level). It is important to note that this cooldown does not apply to the gem as whole; you can trigger multiple spells within the 500 millisecond cooldown time as long as they are different.

Gem level progression

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Quest reward

This skill is not given as quest reward.

Vendor reward

This skill can be bought at the listed npc vendors after completing the following quests:
ClassMarauderTemplarWitchShadowRangerDuelistScion
Quest
The Eternal Nightmare*The items are awarded for this quest when Dialla activates the device
Act 4
Petarus and Vanja
yes
yes
yes
yes
yes
yes
yes
Fallen from Grace
Act 6
Lilly Roth
yes

Strategy

Linking with other skills

At a bare minimum, a Cast On Critical Strike setup will require three gems: an attack, Cast On Critical Strike itself, and a spell to be triggered. This generally leaves at most three other supports that may be linked. If possible, the supports should both increase the number of times Cast On Critical Strike triggers, and increase the effectiveness of the triggered spells. Note that Cast On Critical Strike cannot trigger more than once per frame, so staggered hits (e.g. multiple projectiles) are preferred to simultaneous hits (e.g. most area of effect damage) which will only proc at most once per attack.

Projectile

By far the most popular family of Cast on Critical Strike setups, projectile Cast On Critical Strike focuses on the projectile keyword. Popular attacks for this purpose include:

  • Spectral ThrowSpectral ThrowProjectile, Attack
    Mana Cost: (7 to 9)
    Cast Time: 1.00 sec
    Damage Effectiveness: (54% to 90%)
    Projectile Speed: 1000
    Throws a spectral copy of your melee weapon. It flies out and then returns to you, in a spinning attack that strikes enemies in its path.Per 1% Quality:
    0.5% increased Attack Speed
    Deals (54-90.5)% of Base DamagePlace into an item socket of the right colour to gain this skill. Right click to remove from a socket.
    Spectral Throw skill icon.png
    : Naturally staggers hits, automatic pierce, allows the use of melee weapons at range.
  • BarrageBarrageAttack, Bow
    Mana Cost: (7 to 11)
    Cast Time: 1.00 sec
    Damage Effectiveness: (50% to 61%)
    Requires Level 12After a short preparation time, you attack repeatedly with a ranged weapon. These attacks have a small randomised spread. Only works with Bows and Wands.Per 1% Quality:
    0.5% increased Projectile Damage
    Deals (50-61.4)% of Base Damage
    3 additional Projectiles
    Place into an item socket of the right colour to gain this skill. Right click to remove from a socket.
    Barrage skill icon.png
    : Causes a large number of sequential hits per attack.
  • Power SiphonPower SiphonAttack, Projectile
    Mana Cost: (13 to 15)
    Cast Time: 1.00 sec
    Damage Effectiveness: (130% to 160%)
    Projectile Speed: 750
    Requires Level 12Fires your wand, dealing increased damage and granting you a power charge if an enemy is killed by, or soon after, the hit.Per 1% Quality:
    1% increased Damage
    Deals (130-160.4)% of Base Damage
    Culling Strike
    Place into an item socket of the right colour to gain this skill. Right click to remove from a socket.
    Power Siphon skill icon.png
    : Naturally produces power charges.
  • Split ArrowSplit ArrowAttack, Bow
    Mana Cost: (6 to 10)
    Cast Time: 1.00 sec
    Damage Effectiveness: (90% to 109%)
    Projectile Speed: 3260
    Fires multiple arrows at different targets.Per 1% Quality:
    0.5% increased Attack Speed
    Deals (90-109)% of Base Damage
    (4-6) additional Arrows
    Place into an item socket of the right colour to gain this skill. Right click to remove from a socket.
    Split Arrow skill icon.png
    : Naturally large number of projectiles.
  • Tornado ShotTornado ShotAttack, Bow
    Mana Cost: (8 to 10)
    Cast Time: 1.00 sec
    Damage Effectiveness: (90% to 109%)
    Projectile Speed: 2173
    Requires Level 28Fires a piercing shot that travels until it reaches the targeted location. It will then fire projectiles out in all directions from that point.Per 1% Quality:
    1% increased Projectile Damage
    Deals (90-109)% of Base Damage
    3 secondary Tornado Shot Projectiles
    Place into an item socket of the right colour to gain this skill. Right click to remove from a socket.
    Tornado Shot skill icon.png
    : Piercing on initial arrow(s) and produces three times as many subprojectiles.
  • Frost BladesFrost BladesProjectile, Attack, Melee, Cold
    Mana Cost: 6
    Cast Time: 1.00 sec
    Projectile Speed: 2250
    Attack an enemy with increased range, releasing icy blades from the targeted enemy which fly at other enemies. Requires a Melee Weapon.Per 1% Quality:
    1% increased Projectile Damage
    Deals (100-141.8)% of Base Damage
    (4-7) additional Projectiles
    +(18-21) to Melee Weapon Range
    60% of Physical Damage Converted to Cold Damage
    (0-19)% increased Projectile Speed
    Place into an item socket of the right colour to gain this skill. Right click to remove from a socket.
    Frost Blades skill icon.png
    : Five projectiles plus the initial hit.
  • Molten StrikeMolten StrikeProjectile, Attack, AoE, Melee, Fire
    Mana Cost: 6
    Cast Time: 1.00 sec
    Damage Effectiveness: (120% to 147%)
    Projectile Speed: 750
    Attacks a target with physical and fire damage, causing balls of molten magma to launch forth from your weapon as you swing. These will explode, causing AoE attack damage to enemies where they land.Per 1% Quality:
    1% increased Fire Damage
    Deals (120-146.6)% of Base Damage
    60% of Physical Damage Converted to Fire Damage
    2 additional Projectiles
    Projectiles deal 40% less Damage
    Damage over time caused by Projectiles deals 40% less Damage
    Place into an item socket of the right colour to gain this skill. Right click to remove from a socket.
    Molten Strike skill icon.png
    : Magma balls generally hit on different frames, causing a large number of hits.
  • Lightning StrikeLightning StrikeProjectile, Attack, Melee, Lightning
    Mana Cost: 6
    Cast Time: 1.00 sec
    Damage Effectiveness: (130% to 176%)
    Requires Level 12Infuses your melee weapon with electrical energies as you swing. In addition to converting some of your physical damage to lightning damage, the stored energy is released from the weapon as projectiles as you strike, flying out behind your target to hit farther-away enemies. The projectiles cannot miss if the melee attack hit its target.Per 1% Quality:
    1% increased Lightning Damage
    Deals (130-175.6)% of Base Damage
    50% of Physical Damage Converted to Lightning Damage
    (4-7) additional Projectiles
    Projectiles deal 25% less Damage
    Damage over time caused by Projectiles deals 25% less Damage
    Place into an item socket of the right colour to gain this skill. Right click to remove from a socket.
    Lightning Strike skill icon.png
    : Three projectiles plus the initial hit.

Support skills that affect both the number of hits and crits projectile attacks generate and affect projectile spells include:

  • Greater Multiple Projectiles SupportGreater Multiple Projectiles SupportSupport, Projectile
    Icon: P
    Mana Multiplier: 165%
    Requires Level 38Supports projectile skills.Per 1% Quality:
    Supported Skills have 0.5% increased Attack Speed
    Supported Skills have 0.5% increased Cast Speed
    Supported Skills have 4 additional Projectiles
    Supported Skills deal (35-26)% less Projectile Damage
    This is a Support Gem. It does not grant a bonus to your character, but to skills in sockets connected to it. Place into an item socket connected to a socket containing the Active Skill Gem you wish to augment. Right click to remove from a socket.
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  • Faster Projectiles SupportFaster Projectiles SupportSupport, Projectile
    Icon: j
    Mana Multiplier: 110%
    Requires Level 31Supports projectile skills.Per 1% Quality:
    Supported Skills have 0.5% increased Attack Speed
    Supported Skills have 0.5% increased Cast Speed
    Supported Skills have (50-69)% increased Projectile Speed
    Supported Skills deal (20-29)% increased Projectile Damage
    This is a Support Gem. It does not grant a bonus to your character, but to skills in sockets connected to it. Place into an item socket connected to a socket containing the Active Skill Gem you wish to augment. Right click to remove from a socket.
    for Spectral ThrowSpectral ThrowProjectile, Attack
    Mana Cost: (7 to 9)
    Cast Time: 1.00 sec
    Damage Effectiveness: (54% to 90%)
    Projectile Speed: 1000
    Throws a spectral copy of your melee weapon. It flies out and then returns to you, in a spinning attack that strikes enemies in its path.Per 1% Quality:
    0.5% increased Attack Speed
    Deals (54-90.5)% of Base DamagePlace into an item socket of the right colour to gain this skill. Right click to remove from a socket.
    Spectral Throw skill icon.png
    and certain spells
  • Fork SupportFork SupportSupport, Projectile
    Icon: Y
    Mana Multiplier: 130%
    Requires Level 31Supports projectile skills, making their projectiles fork into two projectiles the first time they hit an enemy and don't pierce it.Per 1% Quality:
    Supported Skills deal 0.5% increased Projectile Damage
    Supported Skills deal (30-11)% less Projectile Damage
    Supported Skills Fork
    This is a Support Gem. It does not grant a bonus to your character, but to skills in sockets connected to it. Place into an item socket connected to a socket containing the Active Skill Gem you wish to augment. Right click to remove from a socket.
  • Pierce SupportPierce SupportSupport, Projectile
    Icon: p
    Mana Multiplier: 110%
    Supports projectile skills.Per 1% Quality:
    Supported Skills deal 0.5% increased Projectile Damage
    Projectiles from Supported Skills Pierce (2-4) additional Targets
    Supported Skills deal (0-19)% more Projectile Damage
    This is a Support Gem. It does not grant a bonus to your character, but to skills in sockets connected to it. Place into an item socket connected to a socket containing the Active Skill Gem you wish to augment. Right click to remove from a socket.
  • Power Charge On Critical SupportPower Charge On Critical SupportSupport
    Icon: P
    Mana Multiplier: 110%
    Requires Level 18Supports any skill that hits enemies.Per 1% Quality:
    Supported Skills have 1% increased Critical Strike Chance
    Supported Skills have (35-54)% chance to gain a Power Charge on Critical StrikeThis is a Support Gem. It does not grant a bonus to your character, but to skills in sockets connected to it. Place into an item socket connected to a socket containing the Active Skill Gem you wish to augment. Right click to remove from a socket.
  • Increased Critical Strikes SupportIncreased Critical Strikes SupportSupport
    Icon: s
    Mana Multiplier: 115%
    Requires Level 8Supports any skill that hits enemies.Per 1% Quality:
    Supported Skills have 1% increased Critical Strike Chance
    Supported Skills have (50-88)% increased Critical Strike Chance
    Supported Skills have +(1-1.9)% to Critical Strike Chance
    This is a Support Gem. It does not grant a bonus to your character, but to skills in sockets connected to it. Place into an item socket connected to a socket containing the Active Skill Gem you wish to augment. Right click to remove from a socket.

Useful projectile spells and their support limitations include:

  • Arctic BreathArctic BreathProjectile, Spell, Duration, AoE, Cold
    Radius: 12
    Mana Cost: (11 to 21)
    Cast Time: 0.80 sec
    Critical Strike Chance: 5.00%
    Projectile Speed: 844
    Requires Level 28Fires a frozen skull projectile that leaves a trail of ground ice behind it. It explodes on impact, creating more ground ice and damaging targets within an area.Per 1% Quality:
    0.5% increased Area of Effect
    Deals (52-608) to (78-913) Cold Damage
    Base duration is (0.88-1.65) seconds
    Place into an item socket of the right colour to gain this skill. Right click to remove from a socket.
    Arctic Breath skill icon.png
    : Does not explode on pierce, fork, or chain.
  • Ball LightningBall LightningProjectile, Spell, AoE, Lightning
    Radius: 20
    Mana Cost: (14 to 27)
    Cast Time: 0.80 sec
    Critical Strike Chance: 5.00%
    Damage Effectiveness: 20%
    Projectile Speed: 400
    Requires Level 28Fires a slow-moving projectile that periodically damages enemies in an area around it with bolts of lightning.Per 1% Quality:
    1% increased Lightning Damage
    Deals (2-14) to (32-260) Lightning DamagePlace into an item socket of the right colour to gain this skill. Right click to remove from a socket.
    Ball Lightning skill icon.png
    : Not affected by pierce, fork, or chain; hit rate limited per cast, not per projectile.
  • Ethereal KnivesEthereal KnivesProjectile, Spell
    Mana Cost: (5 to 23)
    Cast Time: 0.60 sec
    Critical Strike Chance: 6.00%
    Projectile Speed: 1300
    Fires an arc of knives in front of the caster which deals physical damage.Per 1% Quality:
    1% increased Projectile Speed
    Deals (4-459) to (6-688) Physical Damage
    9 additional Projectiles
    (0-19)% increased Projectile Speed
    Place into an item socket of the right colour to gain this skill. Right click to remove from a socket.
    Ethereal Knives skill icon.png
    : Little benefit from Greater Multiple Projectiles SupportGreater Multiple Projectiles SupportSupport, Projectile
    Icon: P
    Mana Multiplier: 165%
    Requires Level 38Supports projectile skills.Per 1% Quality:
    Supported Skills have 0.5% increased Attack Speed
    Supported Skills have 0.5% increased Cast Speed
    Supported Skills have 4 additional Projectiles
    Supported Skills deal (35-26)% less Projectile Damage
    This is a Support Gem. It does not grant a bonus to your character, but to skills in sockets connected to it. Place into an item socket connected to a socket containing the Active Skill Gem you wish to augment. Right click to remove from a socket.
    but more from Faster Projectiles SupportFaster Projectiles SupportSupport, Projectile
    Icon: j
    Mana Multiplier: 110%
    Requires Level 31Supports projectile skills.Per 1% Quality:
    Supported Skills have 0.5% increased Attack Speed
    Supported Skills have 0.5% increased Cast Speed
    Supported Skills have (50-69)% increased Projectile Speed
    Supported Skills deal (20-29)% increased Projectile Damage
    This is a Support Gem. It does not grant a bonus to your character, but to skills in sockets connected to it. Place into an item socket connected to a socket containing the Active Skill Gem you wish to augment. Right click to remove from a socket.
    .
  • FireballFireballProjectile, Spell, AoE, Fire
    Radius: 9
    Mana Cost: (6 to 26)
    Cast Time: 0.85 sec
    Critical Strike Chance: 6.00%
    Projectile Speed: 1040
    Unleashes a ball of fire towards a target which explodes, damaging nearby foes.Per 1% Quality:
    0.5% chance to Ignite enemies
    Deals (7-739) to (10-1109) Fire Damage
    (20-39)% chance to Ignite enemies
    +(0-3) to radius
    Place into an item socket of the right colour to gain this skill. Right click to remove from a socket.
    Fireball skill icon.png
    : Does not explode on pierce, fork, or chain.
  • Freezing PulseFreezing PulseProjectile, Spell, Cold
    Mana Cost: (4 to 18)
    Cast Time: 0.65 sec
    Critical Strike Chance: 6.00%
    Damage Effectiveness: 125%
    Projectile Speed: 1800
    An icy projectile which has a chance to freeze enemies it passes through. The projectile fades quickly, reducing damage and freezing chance until it runs out of time and dissipates completely.Per 1% Quality:
    2% increased Projectile Speed
    Deals (7-689) to (11-1034) Cold Damage
    Projectiles Pierce all Targets
    (0-19)% increased Projectile Speed
    Place into an item socket of the right colour to gain this skill. Right click to remove from a socket.
    Freezing Pulse skill icon.png
    : Benefits from Faster Projectiles SupportFaster Projectiles SupportSupport, Projectile
    Icon: j
    Mana Multiplier: 110%
    Requires Level 31Supports projectile skills.Per 1% Quality:
    Supported Skills have 0.5% increased Attack Speed
    Supported Skills have 0.5% increased Cast Speed
    Supported Skills have (50-69)% increased Projectile Speed
    Supported Skills deal (20-29)% increased Projectile Damage
    This is a Support Gem. It does not grant a bonus to your character, but to skills in sockets connected to it. Place into an item socket connected to a socket containing the Active Skill Gem you wish to augment. Right click to remove from a socket.
    .
  • Ice SpearIce SpearProjectile, Spell, Cold
    Mana Cost: (9 to 27)
    Cast Time: 0.85 sec
    Critical Strike Chance: 7.00%
    Damage Effectiveness: 80%
    Projectile Speed: 1000
    Requires Level 12Launches a shard of ice that pierces close enemies, before exploding on a distant enemy with a much higher critical strike chance.Per 1% Quality:
    2% increased Projectile Speed
    Deals (17-548) to (26-822) Cold Damage
    (40-78)% increased Chill Duration on enemies
    Second form has 600% increased Critical Strike Chance
    (10-29)% increased Effect of Chill
    Place into an item socket of the right colour to gain this skill. Right click to remove from a socket.
    Ice Spear skill icon.png
    : Already pierces in first form.
  • Magma OrbMagma OrbProjectile, Spell, AoE, Fire, Chaining
    Mana Cost: (5 to 22)
    Cast Time: 0.70 sec
    Critical Strike Chance: 5.00%
    Damage Effectiveness: 125%
    Lob a fiery orb that explodes as it strikes the ground. The skill chains, releasing another fiery orb that repeats this effect.Per 1% Quality:
    1% increased Damage
    Deals (6-637) to (9-956) Fire Damage
    Chains +(1-2) Times
    Place into an item socket of the right colour to gain this skill. Right click to remove from a socket.
    Magma Orb skill icon.png
  • SparkSparkProjectile, Spell, Duration, Lightning
    Mana Cost: (5 to 23)
    Cast Time: 0.65 sec
    Critical Strike Chance: 6.00%
    Damage Effectiveness: 70%
    Projectile Speed: 560
    Launches unpredictable sparks that move randomly until they hit an enemy or expire.Per 1% Quality:
    1% increased Projectile Speed
    Deals (1-44) to (20-832) Lightning Damage
    Base duration is 1.5 seconds
    (4-6) additional Projectiles
    Place into an item socket of the right colour to gain this skill. Right click to remove from a socket.
    Spark skill icon.png
    : Less benefit from Greater Multiple Projectiles SupportGreater Multiple Projectiles SupportSupport, Projectile
    Icon: P
    Mana Multiplier: 165%
    Requires Level 38Supports projectile skills.Per 1% Quality:
    Supported Skills have 0.5% increased Attack Speed
    Supported Skills have 0.5% increased Cast Speed
    Supported Skills have 4 additional Projectiles
    Supported Skills deal (35-26)% less Projectile Damage
    This is a Support Gem. It does not grant a bonus to your character, but to skills in sockets connected to it. Place into an item socket connected to a socket containing the Active Skill Gem you wish to augment. Right click to remove from a socket.
    but more from Faster Projectiles SupportFaster Projectiles SupportSupport, Projectile
    Icon: j
    Mana Multiplier: 110%
    Requires Level 31Supports projectile skills.Per 1% Quality:
    Supported Skills have 0.5% increased Attack Speed
    Supported Skills have 0.5% increased Cast Speed
    Supported Skills have (50-69)% increased Projectile Speed
    Supported Skills deal (20-29)% increased Projectile Damage
    This is a Support Gem. It does not grant a bonus to your character, but to skills in sockets connected to it. Place into an item socket connected to a socket containing the Active Skill Gem you wish to augment. Right click to remove from a socket.
    .

A second spell may satisfactorily be used in place of a support.

Area of Effect

Some attacks have advantageous built-in area of effect:

  • Ground SlamGround SlamAttack, AoE, Melee
    Radius: 35
    Mana Cost: 6
    Cast Time: 1.00 sec
    Damage Effectiveness: (90% to 120%)
    The character slams the ground in front of them with their main hand weapon, creating a wave that travels forward and damages enemies with an increased chance to stun. Only works with Staves or Maces.Per 1% Quality:
    1.5% increased Stun Duration on enemies
    Deals (90-120.4)% of Base Damage
    25% reduced Enemy Stun Threshold
    +(0-6) to radius
    Place into an item socket of the right colour to gain this skill. Right click to remove from a socket.
    Ground Slam skill icon.png
    : The area of effect is progressive, not instant, allowing multiple casts per attack. However, it can only get one cast against a single target.

This works well with spells which have Area of Effect component, such as:

  • Cold SnapCold SnapSpell, AoE, Cold
    Radius: 16
    Mana Cost: (11 to 28)
    Can store 1 use(s)
    Cooldown Time: 4.00 sec
    Cast Time: 0.85 sec
    Critical Strike Chance: 5.00%
    Damage Effectiveness: 120%
    Requires Level 4Ice crystals protrude from the ground at target location. Monsters in this area take damage and become frozen. The cooldown can be bypassed by expending a Power Charge.Per 1% Quality:
    0.5% increased Area of Effect
    Deals (9-462) to (13-693) Cold Damage
    30% chance to Freeze enemies
    30% increased Freeze Duration on enemies
    110% increased Chill Duration on enemies
    (20-39)% increased Effect of Chill
    +(0-5) to radius
    Place into an item socket of the right colour to gain this skill. Right click to remove from a socket.
    Cold Snap skill icon.png
  • Ice NovaIce NovaSpell, AoE, Cold
    Radius: 30
    Mana Cost: (10 to 31)
    Cast Time: 0.80 sec
    Critical Strike Chance: 6.00%
    Damage Effectiveness: 70%
    Requires Level 12A chilling circle of ice expands from the caster. If the caster targets near one of their Frostbolt projectiles, it will expand from the projectile instead.Per 1% Quality:
    0.5% increased Area of Effect
    Deals (15-486) to (21-715) Cold Damage
    40% more Damage when Cast on Frostbolt
    Place into an item socket of the right colour to gain this skill. Right click to remove from a socket.
    Ice Nova skill icon.png
  • Flame SurgeFlame SurgeSpell, AoE, Fire
    Radius: 30
    Mana Cost: (5 to 15)
    Cast Time: 0.50 sec
    Critical Strike Chance: 6.00%
    Requires Level 12Strikes enemies in front of you with a surge of flame. Burning enemies are dealt more damage.Per 1% Quality:
    0.5% increased Cast Speed
    Deals (21-514) to (31-771) Fire Damage
    50% more Damage with Hits against Burning enemies
    Cannot Ignite
    Place into an item socket of the right colour to gain this skill. Right click to remove from a socket.
    Flame Surge skill icon.png
  • Glacial CascadeGlacial CascadeSpell, AoE, Cold
    Radius: 12
    Mana Cost: (13 to 26)
    Cast Time: 0.80 sec
    Critical Strike Chance: 5.00%
    Damage Effectiveness: 60%
    Requires Level 28Icicles emerge from the ground in a series of small bursts, each damaging enemies caught in the area.Per 1% Quality:
    1% increased Damage
    Deals (48-422) to (72-633) Physical Damage
    60% of Physical Damage Converted to Cold Damage
    +(0-2) to radius
    Place into an item socket of the right colour to gain this skill. Right click to remove from a socket.
    Glacial Cascade skill icon.png
  • Magma OrbMagma OrbProjectile, Spell, AoE, Fire, Chaining
    Mana Cost: (5 to 22)
    Cast Time: 0.70 sec
    Critical Strike Chance: 5.00%
    Damage Effectiveness: 125%
    Lob a fiery orb that explodes as it strikes the ground. The skill chains, releasing another fiery orb that repeats this effect.Per 1% Quality:
    1% increased Damage
    Deals (6-637) to (9-956) Fire Damage
    Chains +(1-2) Times
    Place into an item socket of the right colour to gain this skill. Right click to remove from a socket.
    Magma Orb skill icon.png

Support gems which can benefit this setup are:

  • Multistrike SupportMultistrike SupportAttack, Melee, Support
    Icon: 3
    Mana Multiplier: 180%
    Requires Level 38Supports melee attack skills, making them repeat twice when used, targeting a random enemy each time. Cannot support Vaal skills, totem skills, channelling skills, or triggered skills.Per 1% Quality:
    Supported Skills deal 0.5% increased Melee Physical Damage
    Supported Skills Repeat 2 additional times
    Supported Skills have (75-94)% more Melee Attack Speed
    Supported Skills deal 30% less Attack Damage
    This is a Support Gem. It does not grant a bonus to your character, but to skills in sockets connected to it. Place into an item socket connected to a socket containing the Active Skill Gem you wish to augment. Right click to remove from a socket.
  • Increased Area of Effect SupportIncreased Area of Effect SupportSupport, AoE
    Icon: E
    Mana Multiplier: 140%
    Requires Level 38Supports any skill with an area of effect.Per 1% Quality:
    Supported Skills deal 0.5% increased Area Damage
    Supported Skills have (30-49)% increased Area of EffectThis is a Support Gem. It does not grant a bonus to your character, but to skills in sockets connected to it. Place into an item socket connected to a socket containing the Active Skill Gem you wish to augment. Right click to remove from a socket.
  • Concentrated Effect SupportConcentrated Effect SupportSupport, AoE
    Icon: o
    Mana Multiplier: 140%
    Requires Level 18Supports any skill with an area of effect, regardless of whether that skill deals damage.Per 1% Quality:
    Supported Skills deal 0.5% increased Area Damage
    Supported Skills have 30% less Area of Effect
    Supported Skills deal (35-54)% more Area Damage
    This is a Support Gem. It does not grant a bonus to your character, but to skills in sockets connected to it. Place into an item socket connected to a socket containing the Active Skill Gem you wish to augment. Right click to remove from a socket.
  • Power Charge On Critical SupportPower Charge On Critical SupportSupport
    Icon: P
    Mana Multiplier: 110%
    Requires Level 18Supports any skill that hits enemies.Per 1% Quality:
    Supported Skills have 1% increased Critical Strike Chance
    Supported Skills have (35-54)% chance to gain a Power Charge on Critical StrikeThis is a Support Gem. It does not grant a bonus to your character, but to skills in sockets connected to it. Place into an item socket connected to a socket containing the Active Skill Gem you wish to augment. Right click to remove from a socket.
  • Increased Critical Strikes SupportIncreased Critical Strikes SupportSupport
    Icon: s
    Mana Multiplier: 115%
    Requires Level 8Supports any skill that hits enemies.Per 1% Quality:
    Supported Skills have 1% increased Critical Strike Chance
    Supported Skills have (50-88)% increased Critical Strike Chance
    Supported Skills have +(1-1.9)% to Critical Strike Chance
    This is a Support Gem. It does not grant a bonus to your character, but to skills in sockets connected to it. Place into an item socket connected to a socket containing the Active Skill Gem you wish to augment. Right click to remove from a socket.

Minion

Another possibility is to use attacks to trigger minions, which benefit from attack supports. In addition to the projectile skills listed before, we have some other good choices:

  • Double StrikeDouble StrikeAttack, Melee
    Mana Cost: 5
    Cast Time: 1.00 sec
    Damage Effectiveness: (70% to 97%)
    Performs two fast attacks on target enemy with your main hand melee weapon.Per 1% Quality:
    0.5% increased Attack Speed
    Deals (70-96.6)% of Base DamagePlace into an item socket of the right colour to gain this skill. Right click to remove from a socket.
    Double Strike skill icon.png
    : Causes two hits per attack, only uses main hand when dual-wielding.
  • CycloneCycloneAttack, AoE, Movement, Melee
    Mana Cost: 12
    Cast Time: 1.00 sec
    Damage Effectiveness: (45% to 56%)
    Requires Level 28Damage enemies around you, then perform a spinning series of attacks as you travel to a target location. Cannot be supported by Multistrike or Ruthless.Per 1% Quality:
    0.5% increased Area of Effect
    Deals (45-56.4)% of Base Damage
    50% more Attack Speed
    30% less Movement Speed
    First Hit deals 50% less Damage
    +(0-3) to Melee range
    Place into an item socket of the right colour to gain this skill. Right click to remove from a socket.
    Cyclone skill icon.png
    : Causes staggered hits rapidly.

Minions generally have poor critical strike capabilities, so critical strike supports are not as effective as they are with projectile spells. Good attack supports include:

  • Faster Attacks SupportFaster Attacks SupportAttack, Support
    Icon: A
    Mana Multiplier: 115%
    Requires Level 18Supports attack skills.Per 1% Quality:
    Supported Skills have 0.5% increased Attack Speed
    Supported Skills have (25-44)% increased Attack SpeedThis is a Support Gem. It does not grant a bonus to your character, but to skills in sockets connected to it. Place into an item socket connected to a socket containing the Active Skill Gem you wish to augment. Right click to remove from a socket.
  • Melee Splash SupportMelee Splash SupportSupport, Melee, Attack, AoE
    Icon: S
    Radius: 14
    Mana Multiplier: 160%
    Requires Level 8Supports single-target melee attack skills, causing their melee strike to deal splash damage around the target.Per 1% Quality:
    Supported Skills have 0.5% increased Area of Effect
    Supported Skills deal (35-26)% less Damage to surrounding targets
    Supported Skills deal Splash Damage to surrounding targets
    Supported Skills have (0-57)% more Melee Splash Area of Effect
    This is a Support Gem. It does not grant a bonus to your character, but to skills in sockets connected to it. Place into an item socket connected to a socket containing the Active Skill Gem you wish to augment. Right click to remove from a socket.
    : While it does not increase procs much due to the splash happening on a single frame, it greatly improves minion effectiveness.
  • Multistrike SupportMultistrike SupportAttack, Melee, Support
    Icon: 3
    Mana Multiplier: 180%
    Requires Level 38Supports melee attack skills, making them repeat twice when used, targeting a random enemy each time. Cannot support Vaal skills, totem skills, channelling skills, or triggered skills.Per 1% Quality:
    Supported Skills deal 0.5% increased Melee Physical Damage
    Supported Skills Repeat 2 additional times
    Supported Skills have (75-94)% more Melee Attack Speed
    Supported Skills deal 30% less Attack Damage
    This is a Support Gem. It does not grant a bonus to your character, but to skills in sockets connected to it. Place into an item socket connected to a socket containing the Active Skill Gem you wish to augment. Right click to remove from a socket.
    : For Melee attacks.
  • Additional Accuracy SupportAdditional Accuracy SupportAttack, Support
    Icon: a
    Requires Level 8Supports attack skills.Per 1% Quality:
    Supported Skills have 1% increased Accuracy Rating
    Supported Skills have +(74-1034) to Accuracy RatingThis is a Support Gem. It does not grant a bonus to your character, but to skills in sockets connected to it. Place into an item socket connected to a socket containing the Active Skill Gem you wish to augment. Right click to remove from a socket.
    : Improves minion accuracy greatly, removes the need for accuracy on gear.
  • Since patch 2.0.0, increasing gem quality on Additional Accuracy SupportAdditional Accuracy SupportAttack, Support
    Icon: a
    Requires Level 8Supports attack skills.Per 1% Quality:
    Supported Skills have 1% increased Accuracy Rating
    Supported Skills have +(74-1034) to Accuracy RatingThis is a Support Gem. It does not grant a bonus to your character, but to skills in sockets connected to it. Place into an item socket connected to a socket containing the Active Skill Gem you wish to augment. Right click to remove from a socket.
    no longer grants 1% increased chance of critical strike per 1% gem quality, and instead gives a simple 1% increased accuracy per 1% gem quality. Accuracy is a desirable stat, as one cannot crit what they cannot actually hit. However, the loss of the critical strike stat granted from gem quality means this is no longer a top-tier supporting gem choice. Losing the critical strike chance affects not only the minion gem in the link; as mentioned minions have poor critical strike capabilities, and were only the minion affected there would be no noticable difference after patch 2.0.0. Of course, this is not the case, as the critical strike chance also affects the attack you are using to proc CoC (the 'trigger' spell), and any other spells to be cast on critical strike (the 'triggered' spells) in the link. This essentially results in less CoC procs overall, less damage from your trigger spell, and less critical hits from your triggered spells as well. This triple-whammy means that Additional Accuracy Support is no longer the top-tier option that it once was, with or without an attached minion and minion-buffing support gems. When considering only the minion, and ignoring any of the triggering/triggered spells & CoC proc rate, the golem/minion is likely perform better with a Faster Attacks Support instead of Additional Accuracy Support; minions will miss more, but making far more attacks per measurement of time. No longer recommended in a CoC link since patch 2.0.0 except to fill in accuracy you desperately need due to poor passive tree and/or gear options.

Most minions are severely capped in number and thus do not benefit much from the high proc rate of Cast On Critical Strike. However, there is one that works well:

  • Summon Raging SpiritSummon Raging SpiritSpell, Minion, Duration, Fire
    Mana Cost: (4 to 12)
    Cast Time: 0.50 sec
    Requires Level 4Summons a short-lived flaming skull that rushes at nearby enemies and attacks them rapidly. Enemies will not directly engage these spirits, and can pass through them.Per 1% Quality:
    1% increased Minion Movement Speed
    Base duration is 5 seconds
    Can summon up to 20 Raging Spirits at a time
    Minions gain 15% less Added Damage
    Minions cannot Taunt Enemies
    Place into an item socket of the right colour to gain this skill. Right click to remove from a socket.
    Summon Raging Spirit skill icon.png

Passives and gear

Since "double-dipping" on support gems is key to an effective Cast On Critical Strike setup, having a 5- or 6-link is more important than it is for most builds.

Unlike conventional attack builds, attack damage is not necessary on passives or gear, though it can be helpful in situations where the linked spells are less effective. Attack speed and critical strike chance are the two essential statistics.

Some base item types tend to have better critical hits per second than others:

  1. Wands
  2. Claws, Daggers
  3. Sceptres, Thrusting Swords
  4. Bows, Staves, 1H Swords

Possibly good uniques to use include:

Item Perfect crits/s
Death's HarpDeath's Harp
Death Bow
Bows
Quality: +20%
Physical Damage: (44 to 49)(116.6 to 129.85)
Critical Strike Chance: (6.50% to 7.50%)
Attacks per Second: 1.32
Weapon Range: 120
Requires Level 32, 107 Dex(30-50)% increased Critical Strike Chance(100-125)% increased Physical Damage
10% increased Attack Speed
+100% to Global Critical Strike Multiplier
Adds an additional Arrow
The mournful music of the strings,
The creaking arch, the arrow sings.
A choking cry, a rattled breath,
The Reaper's Song, the Harp of Death.
9.08%
DoomfletchDoomfletch
Royal Bow
Bows
Quality: +20%
Physical Damage: (26.4 to 31.2)(73.2 to 78)
Critical Strike Chance: 5.00%
Attacks per Second: (1.59 to 1.65)
Weapon Range: 120
Requires Level 28, 95 Dex(20-24)% increased Elemental Damage with Attack SkillsAdds (12-16) to (20-24) Physical Damage
(10-14)% increased Attack Speed
60% increased Mana Regeneration Rate
Gain 100% of Bow Physical Damage as Extra Damage of an Element
"Toasted or frozen
Or twitching in the light
I'm not fussy
And neither is Death."
- Koralus Doomfletch
11.17%
Quill RainQuill Rain
Short Bow
Bows
Quality: +20%
Physical Damage: 13.235.2
Critical Strike Chance: 5.00%
Attacks per Second: 3.00
Weapon Range: 120
Requires Level 5, 26 Dex100% increased Physical Damage
+(10-20) to Dexterity
100% increased Attack Speed
+(25-50) to Accuracy Rating
+2 Mana gained for each Enemy hit by Attacks
(50-100)% increased Projectile Speed
40% less Weapon Damage
"The rain of a thousand quills that whittle
present into past, life into death."
- Rigwald of the Ezomytes
15.50%
WindripperWindripper
Imperial Bow
Bows
Quality: +20%
Physical Damage: 22.893.6
Elemental Damage: (32 to 40)–(48 to 60) 1–(80 to 100)
Critical Strike Chance: (8.00% to 9.00%)
Attacks per Second: (1.59 to 1.67)
Weapon Range: 120
Requires Level 66, 212 Dex(20-24)% increased Elemental Damage with Attack SkillsAdds (32-40) to (48-60) Cold Damage
Adds 1 to (80-100) Lightning Damage
(10-15)% increased Attack Speed
(60-80)% increased Critical Strike Chance
15% increased Quantity of Items Dropped by Slain Frozen Enemies
30% increased Rarity of Items Dropped by Slain Shocked Enemies
It hunts; as silent as falling snow, as deadly as the tempest.
17.25%
Mortem MorsuMortem Morsu
Fright Claw
Claws
Quality: +20%
Physical Damage: (23.4 to 26.4)(89.7 to 101.2)
Critical Strike Chance: 7.88%
Attacks per Second: 1.80
Weapon Range: 9
Requires Level 34, 61 Dex, 61 Int+20 Life gained for each Enemy hit by Attacks(75-100)% increased Physical Damage
20% increased Attack Speed
25% increased Critical Strike Chance
+40% to Global Critical Strike Multiplier
(10-20)% of Physical Damage Converted to Chaos Damage
60% chance to Poison on Hit
25% reduced Enemy Stun Threshold with this Weapon
Fear blisters the heart and thins the blood.
Fear squeezes lungs and sets the guts to fester.
Fear is the wound left untended.
13.16%
Bino's Kitchen KnifeBino's Kitchen Knife
Slaughter Knife
Daggers
Quality: +20%
Physical Damage: (72 to 84)(247.2 to 271.2)
Critical Strike Chance: (8.82% to 9.45%)
Attacks per Second: 1.40
Weapon Range: 8
Requires Level 65, 81 Dex, 117 Int30% increased Global Critical Strike Chance30% increased Damage over Time
Adds (50-60) to (120-140) Physical Damage
(40-50)% increased Critical Strike Chance
+(15-25)% to Global Critical Strike Multiplier
+(8-12)% to Chaos Resistance
On Killing a Poisoned Enemy, nearby Enemies are Poisoned
and nearby Allies Regenerate 200 Life per second
Calling it poison would imply
that it was even edible.
14.28%
Ungil's GaucheUngil's Gauche
Boot Knife
Daggers
Quality: +20%
Physical Damage: (18 to 19.8)(70 to 77)
Elemental Damage: 3–30
Critical Strike Chance: 6.30%
Attacks per Second: 1.54
Weapon Range: 8
Requires Level 20, 31 Dex, 45 Int30% increased Global Critical Strike Chance12% additional Block Chance while Dual Wielding
(80-100)% increased Physical Damage
+(10-20) to Dexterity
Adds 3 to 30 Lightning Damage
10% increased Attack Speed
50% increased Global Critical Strike Chance
Unwieldy and garish became graceful
and deadly in Ungil's nimble hands.
10.47%
DivinariusDivinarius
Imperial Skean
Daggers
Quality: +20%
Physical Damage: 22.891.2
Critical Strike Chance: 6.30%
Attacks per Second: 1.45
Weapon Range: 8
Requires Level 66, 95 Dex, 131 Int30% increased Global Critical Strike Chance(50-70)% increased Spell Damage
(80-100)% increased Critical Strike Chance for Spells
+10 Life gained on Kill
+5 Mana gained on Kill
10% increased Area of Effect
Divine intervention feels better
when you do it yourself.
10.47%
BrightbeakBrightbeak
War Hammer
One Hand Maces
Quality: +20%
Physical Damage: (23.8 to 27.3)(54.4 to 62.4)
Critical Strike Chance: 6.25%
Attacks per Second: 2.10
Weapon Range: 9
Requires Level 20, 71 Str10% reduced Enemy Stun Threshold(50-75)% increased Physical Damage
50% increased Attack Speed
25% increased Critical Strike Chance
+(20-30)% to Fire Resistance
+(20-30)% to Lightning Resistance
"I know how to say 'faster' and 'attack' in Karui, Marak and Ezo."
- Voll of Thebrus
12.19%
Doryani's CatalystDoryani's Catalyst
Vaal Sceptre
Sceptres
Quality: +20%
Physical Damage: (122.4 to 146.4)(204 to 276)
Critical Strike Chance: 6.00%
Attacks per Second: (1.55 to 1.61)
Weapon Range: 9
Requires Level 75, 113 Str, 113 Int32% increased Elemental DamageSocketed Gems are Supported by Level 20 Elemental Proliferation
Adds (65-85) to (100-160) Physical Damage
(11-15)% increased Attack Speed
(6-10)% increased Cast Speed
(30-40)% increased Global Critical Strike Chance
0.2% of Elemental Damage Leeched as Life
(80-100)% increased Elemental Damage
The result of the catalytic reaction would be either immortality for all,
or death for all. It was a risk Doryani was willing to take.
10.75%
Hegemony's EraHegemony's Era
Judgement Staff
Staves
Quality: +20%
Physical Damage: (289.2 to 301.2)(363.6 to 399.6)
Critical Strike Chance: (7.32% to 7.93%)
Attacks per Second: (1.40 to 1.45)
Weapon Range: 11
Requires Level 68, 113 Str, 113 Int18% Chance to Block6% Chance to Block
Adds (180-190) to (190-220) Physical Damage
(12-16)% increased Attack Speed
(20-30)% increased Critical Strike Chance
+1 to Maximum Power Charges
10% chance to gain a Power Charge if you Knock an Enemy Back with Melee Damage
The right to rule demands mental acuity,
a strong arm,
And a tenacious sense of justice.
12.09%
DreamfeatherDreamfeather
Eternal Sword
One Hand Swords
Quality: +20%
Physical Damage: (85.2 to 109.2)(159.6 to 177.6)
Critical Strike Chance: 5.00%
Attacks per Second: (1.80 to 1.88)
Weapon Range: 9
Requires Level 66, 104 Str, 122 Dex+475 to Accuracy RatingAdds (30-50) to (65-80) Physical Damage
(20-25)% increased Attack Speed
+(180-200) to Accuracy Rating
+(180-200) to Evasion Rating
3% increased Movement Speed
1% increased Attack Damage per 450 Evasion Rating
She dances a dance beneath the shade,
The twilight shroud her only blade,
Who now hears her feathersteps flowing?
Beneath the stars, the moondrops glowing.
10.00%
Piscator's VigilPiscator's Vigil
Tornado Wand
Wands
Quality: +20%
Critical Strike Chance: (8.40% to 9.10%)
Attacks per Second: (1.43 to 1.53)
Weapon Range: 120
Requires Level 65, 212 Int(35-39)% increased Spell DamageNo Physical Damage
(10-18)% increased Attack Speed
+(340-400) to Accuracy Rating
(20-30)% increased Critical Strike Chance
Attacks with this Weapon have (100-115)% increased Elemental Damage
Damage with Weapons Penetrates 5% Elemental Resistance
"Stone still, amidst the reeds,
breath fogging in the iron cold air.
he sits, he waits, he watches.
A piscatorial vigil, sat by the river,
his cathedral, his patience his unanswered prayer."
- Jojoba Mansell, bard, angler, adventurer
16.67%
TrypanonTrypanon
Great Mallet
Two Hand Maces
Quality: +20%
Physical Damage: 44.491.2
Critical Strike Chance: 100.00%
Attacks per Second: 0.62
Weapon Range: 11
Requires Level 40, 131 Str30% increased Stun Duration on Enemies50% reduced Attack Speed
All Attacks with this Weapon are Critical Strikes
"Though ingenius instruments have been found,
it seems surgery before thaumaturgy
was not so delicate."
- Icius Perandus, Antiquities Collection, Item 3546
63.00%

Version history

Version Changes
2.4.0
  • For Cast on Critical Strike, Cast on Melee Kill SupportCast on Melee Kill SupportSupport, Melee, Attack, Spell, Trigger
    Icon: &
    Mana Multiplier: 140%
    Can store 1 use(s)
    Cooldown Time: 0.25 sec
    Requires Level 38Must support both a melee attack skill and a spell skill to work. The attack skill will trigger a spell when it kills an enemy. Cannot support totems, traps, or mines. Vaal skills and skills that reserve mana cannot be triggered.Per 1% Quality:
    Supported Skills deal 0.5% increased Damage
    Supported Melee Attacks will Trigger a Supported Spell on Kill
    Supported Spells have (20-39)% more Spell Damage
    You cannot Cast Supported Triggerable Spells directly
    This is a Support Gem. It does not grant a bonus to your character, but to skills in sockets connected to it. Place into an item socket connected to a socket containing the Active Skill Gem you wish to augment. Right click to remove from a socket.
    , MjölnerMjölner
    Gavel
    One Hand Maces
    Quality: +20%
    Physical Damage: (108 to 129.6)(202 to 242.4)
    Critical Strike Chance: 5.00%
    Attacks per Second: 1.15
    Weapon Range: 9
    Requires Level 60, 412 Str, 300 Int15% reduced Enemy Stun Threshold(80-120)% increased Physical Damage
    Skills Chain +1 times
    (30-40)% increased Lightning Damage with Attack Skills
    +200 Strength Requirement
    +300 Intelligence Requirement
    Trigger a Socketed Lightning Spell on Hit
    Socketed Lightning Spells deal 100% increased Spell Damage if Triggered
    Look the storm in the eye and you will have its respect.
    and Cospri's MaliceCospri's Malice
    Jewelled Foil
    Thrusting One Hand Swords
    Quality: +20%
    Elemental Damage: (80 to 100)–(160 to 200)
    Critical Strike Chance: 5.50%
    Attacks per Second: (1.73 to 1.82)
    Weapon Range: 12
    Requires Level 68, 212 Dex, 257 Int+25% to Global Critical Strike MultiplierNo Physical Damage
    Adds (80-100) to (160-200) Cold Damage
    Adds (40-60) to (90-110) Cold Damage to Spells
    (8-14)% increased Attack Speed
    +257 Intelligence Requirement
    60% increased Critical Strike Chance against Chilled Enemies
    Trigger a Socketed Cold Spell on Melee Critical Strike
    Breathe deep, my child.
    Let the frigid air engulf your soul.
    Embrace the eternal cold,
    And it will embrace you back.
    , only one skill can be triggered per trigger event.
  • The spell that is triggered is determined based on the order in which it is socketed, and will cast supported spells in sequence, even across multiple attacks. These items and skills also have cooldowns which limit how often a skill is cast.
  • These cooldowns apply per-triggered-skill, rather than applying to the trigger gem itself.
  • Cast on Critical Strike now has a 500ms cooldown, and will now only trigger one spell per frame when you critically strike. It now has 100% chance to trigger casts when you critically strike. It now has 20% more spell damage at level 1, tapered up to 39% at level 20 (1% per level).
1.3.0
  • Cast on Critical Strike's cooldown has been increased from 0.01 seconds to 0.05 seconds.
1.2.0
  • The chance to cast has been reduced by a flat 20% at all levels.
1.0.5
  • Cast on Critical Strike now has a 10 millisecond cooldown. The chance to cast supported skills has been increased by a flat 20%.
1.0.0e
  • The Cast on Crit support gem has been renamed to Cast on Critical Strike
1.0.0
  • Cast on Crit has been added to the game.