Cast On Critical Strike

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Cast On Critical StrikeSupport, Spell, Trigger
Icon: &
Mana Multiplier: 140%
Can store 1 use(s)
Cooldown Time: 0.05 sec
Drop Level: 38
Requires Level 38
Per 1% Quality:
1% increased Critical Strike Chance
Supported Attacks have a (50 to 69)% chance to Cast Supported Spells when you Crit an Enemy
You cannot Cast Supported Spells directly
This is a Support Gem. It does not grant a bonus to your character, but 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 inventory icon.png

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 separately, so it's possible to cast either one of them, both, or none.

Cooldown Time: When a supported spell is successfully cast, it and all supported spells of the same name are put on cooldown for 50 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 50 millisecond cooldown time as long as they are different.

Gem level progression

LevelLvl.dexterityintelligenceCast
Chance
Exp.Total Exp.
138402750%00
240412951%388,734388,734
342433052%477,437866,171
444453153%583,7861,449,957
546473354%710,3592,160,316
648493455%1,355,5113,515,827
750513556%1,138,8774,654,704
852533757%1,368,2336,022,937
954553858%1,638,3387,661,275
1056573959%1,956,6489,617,923
1158584160%3,655,18413,273,107
1260604261%3,017,32716,290,434
1362624362%3,576,23219,866,666
1464644463%4,231,66724,098,333
1565654564%2,395,07826,493,411
1666664665%8,421,06334,914,474
1767674666%16,159,98351,074,457
1868684767%41,170,36792,244,824
1969694868%86,794,448179,039,272
2070704869%157,405,063336,444,335
2172725070%N/AN/A
2274N/AN/A71%N/AN/A
2376N/AN/A72%N/AN/A
2478N/AN/A73%N/AN/A
2580N/AN/A74%N/AN/A
2682N/AN/A75%N/AN/A
2784N/AN/A76%N/AN/A
2886N/AN/A77%N/AN/A
2988N/AN/A78%N/AN/A
3090N/AN/A79%N/AN/A

Quest reward

This skill is given as quest reward for the following quests:
ClassMarauderTemplarWitchShadowRangerDuelistScion
Quest
A Fixture of Fate
Act 3
Cruel
no
no
no
yes
yes
no
yes

Vendor reward

This skill can be bought at the listed npc vendors after completing the following quests:
ClassMarauderTemplarWitchShadowRangerDuelistScion
Quest
The Eternal Nightmare
Act 4
Petarus and Vanja

Cost:
Orb of AlchemyOrb of AlchemyStack Size: 10Upgrades a normal item to rare itemRight click this item then left click a normal item to apply it.
Shift click to unstack.
yes
yes
yes
yes
yes
yes
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 Throw inventory icon.pngSpectral Throw
    Spectral ThrowProjectile, Attack
    Mana Cost: (7 to 9)
    Cast Time: 1.00 sec
    Drop Level: 1
    Requires Level 1
    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
    Place into an item socket of the right colour to gain this skill. Right click to remove from a socket.
    Spectral Throw inventory icon.pngSpectral Throw skill icon.png
    : Naturally staggers hits, automatic pierce, allows the use of melee weapons at range.
  • Barrage inventory icon.pngBarrage
    BarrageAttack, Bow
    Mana Cost: (7 to 11)
    Cast Time: 1.00 sec
    Drop Level: 12
    Requires Level 12
    After 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
    3 additional ProjectilesPlace into an item socket of the right colour to gain this skill. Right click to remove from a socket.
    Barrage inventory icon.pngBarrage skill icon.png
    : Causes a large number of sequential hits per attack.
  • Power Siphon inventory icon.pngPower Siphon
    Power SiphonAttack, Projectile
    Mana Cost: (13 to 15)
    Cast Time: 1.00 sec
    Drop Level: 12
    Requires Level 12
    Fires 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
    Place into an item socket of the right colour to gain this skill. Right click to remove from a socket.
    Power Siphon inventory icon.pngPower Siphon skill icon.png
    : Naturally produces power charges.
  • Split Arrow inventory icon.pngSplit Arrow
    Split ArrowAttack, Bow
    Mana Cost: (6 to 10)
    Cast Time: 1.00 sec
    Drop Level: 1
    Requires Level 1
    Fires multiple arrows at different targets.Per 1% Quality:
    0.5% increased Attack Speed
    (4 to 6) additional ArrowsPlace into an item socket of the right colour to gain this skill. Right click to remove from a socket.
    Split Arrow inventory icon.pngSplit Arrow skill icon.png
    : Naturally large number of projectiles.
  • Tornado Shot inventory icon.pngTornado Shot
    Tornado ShotAttack, Bow
    Mana Cost: (8 to 10)
    Cast Time: 1.00 sec
    Drop Level: 28
    Requires Level 28
    Fires 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
    3 secondary Tornado Shot ProjectilesPlace into an item socket of the right colour to gain this skill. Right click to remove from a socket.
    Tornado Shot inventory icon.pngTornado Shot skill icon.png
    : Piercing on initial arrow(s) and produces three times as many subprojectiles.
  • Frost Blades inventory icon.pngFrost Blades
    Frost BladesProjectile, Attack, Melee, Cold
    Mana Cost: 6
    Cast Time: 1.00 sec
    Drop Level: 1
    Requires Level 1
    Attack with increased range, releasing icy blades from the struck enemy that fly at other enemies. Requires a Melee Weapon.Per 1% Quality:
    1% increased Projectile Damage
    (4 to 7) additional Projectiles
    +(18 to 21) to Melee Weapon Range
    40% of Physical Damage converted to Cold Damage
    (0 to 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 inventory icon.pngFrost Blades skill icon.png
    : Five projectiles plus the initial hit.
  • Molten Strike inventory icon.pngMolten Strike
    Molten StrikeProjectile, Attack, AoE, Melee, Fire
    Mana Cost: 6
    Cast Time: 1.00 sec
    Drop Level: 1
    Requires Level 1
    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
    60% of Physical Damage Converted to Fire Damage
    2 additional Projectiles
    40% less Projectile Damage
    Place into an item socket of the right colour to gain this skill. Right click to remove from a socket.
    Molten Strike inventory icon.pngMolten Strike skill icon.png
    : Magma balls generally hit on different frames, causing a large number of hits.
  • Lightning Strike inventory icon.pngLightning Strike
    Lightning StrikeProjectile, Attack, Melee, Lightning
    Mana Cost: 6
    Cast Time: 1.00 sec
    Drop Level: 12
    Requires Level 12
    Infuses 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:
    2% chance of Projectiles Piercing
    50% of Physical Damage Converted to Lightning Damage
    (4 to 7) additional Projectiles
    25% less Projectile Damage
    Place into an item socket of the right colour to gain this skill. Right click to remove from a socket.
    Lightning Strike inventory icon.pngLightning 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 inventory icon.pngGreater Multiple Projectiles
    Greater Multiple ProjectilesSupport, Projectile
    Icon: P
    Mana Multiplier: 165%
    Drop Level: 38
    Requires Level 38
    Per 1% Quality:
    0.5% increased Attack Speed
    0.5% increased Cast Speed
    4 additional Projectiles
    (35 to 26)% less Projectile Damage
    This is a Support Gem. It does not grant a bonus to your character, but 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.
    Greater Multiple Projectiles inventory icon.png
  • Chain inventory icon.pngChain
    ChainSupport, Chaining, Projectile
    Icon: c
    Mana Multiplier: 150%
    Drop Level: 38
    Requires Level 38
    Per 1% Quality:
    1% increased Projectile Speed
    Chain +2 Times
    (50 to 31)% less Damage
    This is a Support Gem. It does not grant a bonus to your character, but 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.
    Chain inventory icon.png
  • Faster Projectiles inventory icon.pngFaster Projectiles
    Faster ProjectilesSupport, Projectile
    Icon: j
    Mana Multiplier: 110%
    Drop Level: 31
    Requires Level 31
    Per 1% Quality:
    0.5% increased Attack Speed
    0.5% increased Cast Speed
    (50 to 69)% increased Projectile Speed
    (20 to 29)% increased Projectile Damage
    This is a Support Gem. It does not grant a bonus to your character, but 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.
    Faster Projectiles inventory icon.png
    for Spectral Throw inventory icon.pngSpectral Throw
    Spectral ThrowProjectile, Attack
    Mana Cost: (7 to 9)
    Cast Time: 1.00 sec
    Drop Level: 1
    Requires Level 1
    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
    Place into an item socket of the right colour to gain this skill. Right click to remove from a socket.
    Spectral Throw inventory icon.pngSpectral Throw skill icon.png
    and certain spells
  • Fork inventory icon.pngFork
    ForkSupport, Projectile
    Icon: Y
    Mana Multiplier: 130%
    Drop Level: 31
    Requires Level 31
    Per 1% Quality:
    0.5% increased Projectile Damage
    (30 to 11)% less Projectile Damage
    Projectiles Fork
    This is a Support Gem. It does not grant a bonus to your character, but 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.
    Fork inventory icon.png
  • Pierce inventory icon.pngPierce
    PierceSupport, Projectile
    Icon: p
    Mana Multiplier: 110%
    Drop Level: 31
    Requires Level 31
    Per 1% Quality:
    0.5% increased Projectile Damage
    50% chance of Projectiles Piercing
    (10 to 29)% more Projectile Damage
    This is a Support Gem. It does not grant a bonus to your character, but 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 inventory icon.png
  • Power Charge On Critical inventory icon.pngPower Charge On Critical
    Power Charge On CriticalSupport
    Icon: P
    Mana Multiplier: 110%
    Drop Level: 18
    Requires Level 18
    Per 1% Quality:
    1% increased Critical Strike Chance
    (35 to 54)% chance to gain a Power Charge on Critical StrikeThis is a Support Gem. It does not grant a bonus to your character, but 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 inventory icon.png
  • Increased Critical Strikes inventory icon.pngIncreased Critical Strikes
    Increased Critical StrikesSupport
    Icon: s
    Mana Multiplier: 115%
    Drop Level: 8
    Requires Level 8
    Per 1% Quality:
    1% increased Critical Strike Chance
    (50 to 88)% increased Critical Strike Chance
    +(1.0 to 1.9)% to Critical Strike Chance
    This is a Support Gem. It does not grant a bonus to your character, but 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 inventory icon.png

Useful projectile spells and their support limitations include:

  • Arctic Breath inventory icon.pngArctic Breath
    Arctic BreathProjectile, Spell, Duration, AoE, Cold
    Radius: 12
    Mana Cost: (11 to 21)
    Cast Time: 0.80 sec
    Critical Strike Chance: 5.00%
    Drop Level: 28
    Requires Level 28
    Fires 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 radius
    Deals (46 to 451)-(70 to 677) Cold Damage
    Base duration is (0.88 to 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 inventory icon.pngArctic Breath skill icon.png
    : Does not explode on pierce, fork, or chain.
  • Ball Lightning inventory icon.pngBall Lightning
    Ball LightningProjectile, Spell, AoE, Lightning
    Radius: 16
    Mana Cost: (14 to 27)
    Cast Time: 0.80 sec
    Critical Strike Chance: 5.00%
    Damage Effectiveness: 20%
    Drop Level: 28
    Requires Level 28
    Fires 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 to 14)-(32 to 260) Lightning DamagePlace into an item socket of the right colour to gain this skill. Right click to remove from a socket.
    Ball Lightning inventory icon.pngBall Lightning skill icon.png
    : Not affected by pierce, fork, or chain; hit rate limited per cast, not per projectile.
  • Ethereal Knives inventory icon.pngEthereal Knives
    Ethereal KnivesProjectile, Spell
    Mana Cost: (5 to 23)
    Cast Time: 0.60 sec
    Critical Strike Chance: 6.00%
    Drop Level: 1
    Requires Level 1
    Fires an arc of knives in front of the caster which deals physical damage.Per 1% Quality:
    1% increased Projectile Speed
    Deals (4 to 459)-(6 to 688) Physical Damage
    9 additional Projectiles
    (0 to 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 inventory icon.pngEthereal Knives skill icon.png
    : Little benefit from Greater Multiple Projectiles inventory icon.pngGreater Multiple Projectiles
    Greater Multiple ProjectilesSupport, Projectile
    Icon: P
    Mana Multiplier: 165%
    Drop Level: 38
    Requires Level 38
    Per 1% Quality:
    0.5% increased Attack Speed
    0.5% increased Cast Speed
    4 additional Projectiles
    (35 to 26)% less Projectile Damage
    This is a Support Gem. It does not grant a bonus to your character, but 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.
    Greater Multiple Projectiles inventory icon.png
    but more from Faster Projectiles inventory icon.pngFaster Projectiles
    Faster ProjectilesSupport, Projectile
    Icon: j
    Mana Multiplier: 110%
    Drop Level: 31
    Requires Level 31
    Per 1% Quality:
    0.5% increased Attack Speed
    0.5% increased Cast Speed
    (50 to 69)% increased Projectile Speed
    (20 to 29)% increased Projectile Damage
    This is a Support Gem. It does not grant a bonus to your character, but 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.
    Faster Projectiles inventory icon.png
    .
  • Fireball inventory icon.pngFireball
    FireballProjectile, Spell, AoE, Fire
    Radius: 9
    Mana Cost: (6 to 26)
    Cast Time: 0.85 sec
    Critical Strike Chance: 6.00%
    Drop Level: 1
    Requires Level 1
    Unleashes a ball of fire towards a target which explodes, damaging nearby foes.Per 1% Quality:
    0.5% chance to Ignite enemies
    Deals (7 to 496)-(10 to 744) Fire Damage
    (20 to 39)% chance to Ignite enemies
    Place into an item socket of the right colour to gain this skill. Right click to remove from a socket.
    Fireball inventory icon.pngFireball skill icon.png
    : Does not explode on pierce, fork, or chain.
  • Freezing Pulse inventory icon.pngFreezing Pulse
    Freezing PulseProjectile, Spell, Cold
    Mana Cost: (4 to 18)
    Cast Time: 0.65 sec
    Critical Strike Chance: 6.00%
    Damage Effectiveness: 125%
    Drop Level: 1
    Requires Level 1
    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 to 689)-(11 to 1034) Cold Damage
    (0 to 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 inventory icon.pngFreezing Pulse skill icon.png
    : Benefits from Faster Projectiles inventory icon.pngFaster Projectiles
    Faster ProjectilesSupport, Projectile
    Icon: j
    Mana Multiplier: 110%
    Drop Level: 31
    Requires Level 31
    Per 1% Quality:
    0.5% increased Attack Speed
    0.5% increased Cast Speed
    (50 to 69)% increased Projectile Speed
    (20 to 29)% increased Projectile Damage
    This is a Support Gem. It does not grant a bonus to your character, but 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.
    Faster Projectiles inventory icon.png
    .
  • Ice Spear inventory icon.pngIce Spear
    Ice SpearProjectile, Spell, Cold
    Mana Cost: (9 to 27)
    Cast Time: 0.85 sec
    Critical Strike Chance: 7.00%
    Damage Effectiveness: 80%
    Drop Level: 12
    Requires Level 12
    Launches 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 (16 to 321)-(24 to 482) Cold Damage
    (40 to 78)% increased Chill Duration on enemies
    Second form has 600% increased Critical Strike Chance
    Place into an item socket of the right colour to gain this skill. Right click to remove from a socket.
    Ice Spear inventory icon.pngIce Spear skill icon.png
    : Already pierces in first form.
  • Magma Orb inventory icon.pngMagma Orb
    Magma OrbProjectile, Spell, AoE, Fire, Chaining
    Mana Cost: (5 to 22)
    Cast Time: 0.70 sec
    Critical Strike Chance: 5.00%
    Damage Effectiveness: 125%
    Drop Level: 1
    Requires Level 1
    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 to 637)-(9 to 956) Fire Damage
    Chain +(1 to 2) Times
    Place into an item socket of the right colour to gain this skill. Right click to remove from a socket.
    Magma Orb inventory icon.pngMagma Orb skill icon.png
  • Spark inventory icon.pngSpark
    SparkProjectile, Spell, Duration, Lightning
    Mana Cost: (5 to 23)
    Cast Time: 0.65 sec
    Critical Strike Chance: 6.00%
    Damage Effectiveness: 70%
    Drop Level: 1
    Requires Level 1
    Launches unpredictable sparks that move randomly until they hit an enemy or expire.Per 1% Quality:
    2% increased Projectile Speed
    Deals (1 to 44)-(20 to 832) Lightning Damage
    Base duration is 1.5 seconds
    (4 to 6) additional Projectiles
    Place into an item socket of the right colour to gain this skill. Right click to remove from a socket.
    Spark inventory icon.pngSpark skill icon.png
    : Less benefit from Greater Multiple Projectiles inventory icon.pngGreater Multiple Projectiles
    Greater Multiple ProjectilesSupport, Projectile
    Icon: P
    Mana Multiplier: 165%
    Drop Level: 38
    Requires Level 38
    Per 1% Quality:
    0.5% increased Attack Speed
    0.5% increased Cast Speed
    4 additional Projectiles
    (35 to 26)% less Projectile Damage
    This is a Support Gem. It does not grant a bonus to your character, but 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.
    Greater Multiple Projectiles inventory icon.png
    but more from Faster Projectiles inventory icon.pngFaster Projectiles
    Faster ProjectilesSupport, Projectile
    Icon: j
    Mana Multiplier: 110%
    Drop Level: 31
    Requires Level 31
    Per 1% Quality:
    0.5% increased Attack Speed
    0.5% increased Cast Speed
    (50 to 69)% increased Projectile Speed
    (20 to 29)% increased Projectile Damage
    This is a Support Gem. It does not grant a bonus to your character, but 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.
    Faster Projectiles inventory icon.png
    .

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 Slam inventory icon.pngGround Slam
    Ground SlamAttack, AoE, Melee
    Radius: 35
    Mana Cost: 6
    Cast Time: 1.00 sec
    Drop Level: 1
    Requires Level 1
    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
    25% reduced Enemy Stun Threshold
    (0 to 19)% increased Area of Effect radius
    Place into an item socket of the right colour to gain this skill. Right click to remove from a socket.
    Ground Slam inventory icon.pngGround 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 Snap inventory icon.pngCold Snap
    Cold 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%
    Drop Level: 4
    Requires Level 4
    Ice 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 radius
    Deals (9 to 462)-(13 to 693) Cold Damage
    30% chance to Freeze enemies
    30% increased Freeze Duration on enemies
    110% increased Chill Duration on enemies
    Place into an item socket of the right colour to gain this skill. Right click to remove from a socket.
    Cold Snap inventory icon.pngCold Snap skill icon.png
  • Ice Nova inventory icon.pngIce Nova
    Ice NovaSpell, AoE, Cold
    Radius: 30
    Mana Cost: (10 to 31)
    Cast Time: 0.90 sec
    Critical Strike Chance: 6.00%
    Damage Effectiveness: 70%
    Drop Level: 12
    Requires Level 12
    A chilling circle of ice expands from the caster.Per 1% Quality:
    0.5% increased Area of Effect radius
    Deals (14 to 369)-(21 to 577) Cold DamagePlace into an item socket of the right colour to gain this skill. Right click to remove from a socket.
    Ice Nova inventory icon.pngIce Nova skill icon.png
  • Flame Surge inventory icon.pngFlame Surge
    Flame SurgeSpell, AoE, Fire
    Radius: 30
    Mana Cost: (9 to 26)
    Cast Time: 0.50 sec
    Critical Strike Chance: 6.00%
    Drop Level: 12
    Requires Level 12
    Strikes 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 to 514)-(31 to 771) Fire Damage
    50% more Damage against Burning enemies
    Place into an item socket of the right colour to gain this skill. Right click to remove from a socket.
    Flame Surge inventory icon.pngFlame Surge skill icon.png
  • Glacial Cascade inventory icon.pngGlacial Cascade
    Glacial CascadeSpell, AoE, Cold
    Mana Cost: (13 to 26)
    Cast Time: 0.80 sec
    Critical Strike Chance: 5.00%
    Damage Effectiveness: 60%
    Drop Level: 28
    Requires Level 28
    Icicles emerge from the ground in a series of small bursts, each damaging enemies caught in the area.Per 1% Quality:
    1% increased Damage
    Deals (12 to 110)-(19 to 169) Physical Damage
    Deals (23 to 203)-(35 to 307) Cold Damage
    Place into an item socket of the right colour to gain this skill. Right click to remove from a socket.
    Glacial Cascade inventory icon.pngGlacial Cascade skill icon.png
  • Magma Orb inventory icon.pngMagma Orb
    Magma OrbProjectile, Spell, AoE, Fire, Chaining
    Mana Cost: (5 to 22)
    Cast Time: 0.70 sec
    Critical Strike Chance: 5.00%
    Damage Effectiveness: 125%
    Drop Level: 1
    Requires Level 1
    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 to 637)-(9 to 956) Fire Damage
    Chain +(1 to 2) Times
    Place into an item socket of the right colour to gain this skill. Right click to remove from a socket.
    Magma Orb inventory icon.pngMagma Orb skill icon.png

Support gems which can benefit this setup are:

  • Multistrike inventory icon.pngMultistrike
    MultistrikeAttack, Melee, Support
    Icon: 3
    Mana Multiplier: 180%
    Drop Level: 38
    Requires Level 38
    Per 1% Quality:
    0.5% increased Melee Physical Damage
    Supported Melee Attacks Repeat 2 additional times
    (75 to 94)% more Melee Attack Speed
    30% less Attack Damage
    This is a Support Gem. It does not grant a bonus to your character, but 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.
    Multistrike inventory icon.png
  • Increased Area of Effect inventory icon.pngIncreased Area of Effect
    Increased Area of EffectSupport, AoE
    Icon: E
    Mana Multiplier: 140%
    Drop Level: 38
    Requires Level 38
    Per 1% Quality:
    0.5% increased Area Damage
    (20 to 39)% increased Area of Effect radiusThis is a Support Gem. It does not grant a bonus to your character, but 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 inventory icon.png
  • Concentrated Effect inventory icon.pngConcentrated Effect
    Concentrated EffectSupport, AoE
    Icon: o
    Mana Multiplier: 140%
    Drop Level: 18
    Requires Level 18
    Per 1% Quality:
    0.5% increased Area Damage
    25% less Area of Effect radius
    (40 to 59)% more Area Damage
    This is a Support Gem. It does not grant a bonus to your character, but 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 inventory icon.png
  • Power Charge On Critical inventory icon.pngPower Charge On Critical
    Power Charge On CriticalSupport
    Icon: P
    Mana Multiplier: 110%
    Drop Level: 18
    Requires Level 18
    Per 1% Quality:
    1% increased Critical Strike Chance
    (35 to 54)% chance to gain a Power Charge on Critical StrikeThis is a Support Gem. It does not grant a bonus to your character, but 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 inventory icon.png
  • Increased Critical Strikes inventory icon.pngIncreased Critical Strikes
    Increased Critical StrikesSupport
    Icon: s
    Mana Multiplier: 115%
    Drop Level: 8
    Requires Level 8
    Per 1% Quality:
    1% increased Critical Strike Chance
    (50 to 88)% increased Critical Strike Chance
    +(1.0 to 1.9)% to Critical Strike Chance
    This is a Support Gem. It does not grant a bonus to your character, but 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 inventory icon.png

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 Strike inventory icon.pngDouble Strike
    Double StrikeAttack, Melee
    Mana Cost: 5
    Cast Time: 1.00 sec
    Drop Level: 1
    Requires Level 1
    Performs two fast attacks on target enemy with your main hand melee weapon.Per 1% Quality:
    0.5% increased Attack Speed
    Place into an item socket of the right colour to gain this skill. Right click to remove from a socket.
    Double Strike inventory icon.pngDouble Strike skill icon.png
    : Causes two hits per attack, only uses main hand when dual-wielding.
  • Cyclone inventory icon.pngCyclone
    CycloneAttack, AoE, Movement, Melee
    Mana Cost: 12
    Cast Time: 1.00 sec
    Drop Level: 28
    Requires Level 28
    Damage enemies around you, then perform a spinning series of attacks as you travel to a target location.Per 1% Quality:
    0.5% increased Area of Effect radius
    50% more Attack Speed
    30% less Movement Speed
    First Hit deals 50% less Damage
    Place into an item socket of the right colour to gain this skill. Right click to remove from a socket.
    Cyclone inventory icon.pngCyclone 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:

  • Additional Accuracy inventory icon.pngAdditional Accuracy
    Additional AccuracyAttack, Support
    Icon: a
    Drop Level: 8
    Requires Level 8
    Per 1% Quality:
    1% increased Accuracy Rating
    +(74 to 1034) to Accuracy RatingThis is a Support Gem. It does not grant a bonus to your character, but 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.
    Additional Accuracy inventory icon.png
    : Improves minion accuracy greatly, removes the need for accuracy on gear, and quality gives extra critical strike chance.
  • Faster Attacks inventory icon.pngFaster Attacks
    Faster AttacksAttack, Support
    Icon: A
    Mana Multiplier: 115%
    Drop Level: 18
    Requires Level 18
    Per 1% Quality:
    0.5% increased Attack Speed
    (25 to 44)% increased Attack SpeedThis is a Support Gem. It does not grant a bonus to your character, but 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.
    Faster Attacks inventory icon.png
  • Melee Splash inventory icon.pngMelee Splash
    Melee SplashSupport, Melee, Attack, AoE
    Icon: S
    Mana Multiplier: 160%
    Drop Level: 8
    Requires Level 8
    Per 1% Quality:
    0.5% increased Area of Effect radius
    (50 to 31)% less Damage to other targets
    (0 to 19)% more Melee Splash Radius
    Single-target Melee attacks deal Splash Damage to surrounding targets
    This is a Support Gem. It does not grant a bonus to your character, but 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 inventory icon.png
    : While it does not increase procs much due to the splash happening on a single frame, it greatly improves minion effectiveness.
  • Multistrike inventory icon.pngMultistrike
    MultistrikeAttack, Melee, Support
    Icon: 3
    Mana Multiplier: 180%
    Drop Level: 38
    Requires Level 38
    Per 1% Quality:
    0.5% increased Melee Physical Damage
    Supported Melee Attacks Repeat 2 additional times
    (75 to 94)% more Melee Attack Speed
    30% less Attack Damage
    This is a Support Gem. It does not grant a bonus to your character, but 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.
    Multistrike inventory icon.png
    : For Melee attacks.

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 Spirit inventory icon.pngSummon Raging Spirit
    Summon Raging SpiritSpell, Minion, Duration, Fire
    Mana Cost: (4 to 12)
    Cast Time: 0.50 sec
    Drop Level: 4
    Requires Level 4
    Summons 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 5.0 seconds
    Can summon up to 50 Raging Spirits at a time
    Place into an item socket of the right colour to gain this skill. Right click to remove from a socket.
    Summon Raging Spirit inventory icon.pngSummon 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, Staffs, 1H Swords

Possibly good uniques to use include:

Item Perfect crits/s
Death's HarpDeath's Harp
Death Bow
Bow
Physical Damage: (44–50 to 116–131)
Critical Strike Chance: (5.00 to 7.50)%
Attacks per Second: 1.32
Requires Level 32, 107 Dex
(30 to 50)% increased Critical Strike Chance(100 to 125)% increased Physical Damage
10% increased Attack Speed
+150% 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
Bow
Physical Damage: (18–57 to 22–61)
Critical Strike Chance: (6.50 to 7.00)%
Attacks per Second: (1.59 to 1.65)
Requires Level 28, 95 Dex
(6 to 12)% increased Elemental Damage with WeaponsAdds (8–16 to 12–20) Physical Damage
(10 to 14)% increased Attack Speed
(30 to 40)% increased Critical Strike Chance
60% increased Mana Regeneration Rate
Gain 110% 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
Bow
Physical Damage: 6–16
Critical Strike Chance: 5%
Attacks per Second: 3.00
Requires Level 5, 26 Dex
+(10 to 20) to Dexterity
100% increased Attack Speed
+(25 to 50) to Accuracy Rating
(50 to 100)% increased Projectile Speed
50% 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
Bow
Physical Damage: 19–78
Elemental Damage: (32–48 to 40–60), (1–80 to 1–100)
Critical Strike Chance: (8 to 9)%
Attacks per Second: (1.59 to 1.67)
Requires Level 66, 212 Dex
(6 to 12)% increased Elemental Damage with WeaponsAdds (32–48 to 40–60) Cold Damage
Adds (1–80 to 1–100) Lightning Damage
(10 to 15)% increased Attack Speed
(60 to 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
Claw
Physical Damage: (16–65 to 18–74)
Critical Strike Chance: 7.88%
Attacks per Second: 1.80
Requires Level 34, 61 Dex, 61 Int
2% of Physical Attack Damage Leeched as Life(75 to 100)% increased Physical Damage
20% increased Attack Speed
25% increased Critical Strike Chance
+40% to Global Critical Strike Multiplier
(10 to 20)% of Physical Damage Converted to Chaos Damage
Poisonous 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
Dagger
Physical Damage: (59–198 to 69–218)
Critical Strike Chance: (9.24 to 9.90)%
Attacks per Second: 1.40
Requires Level 65, 81 Dex, 117 Int
40% increased Global Critical Strike Chance30% increased Damage over Time
Adds (50–120 to 60–140) Physical Damage
(40 to 50)% increased Critical Strike Chance
+(15 to 25)% to Global Critical Strike Multiplier
+(8 to 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
Dagger
Physical Damage: (14–54 to 16–60)
Elemental Damage: 3–30
Critical Strike Chance: 6.6%
Attacks per Second: 1.54
Requires Level 20, 31 Dex, 45 Int
40% increased Global Critical Strike Chance12% additional Chance to Block while Dual Wielding
(80 to 100)% increased Physical Damage
+(10 to 20) to Dexterity
Adds 3–30 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
Dagger
Physical Damage: 17–69
Critical Strike Chance: 6.6%
Attacks per Second: 1.45
Requires Level 66, 95 Dex, 131 Int
40% increased Global Critical Strike Chance(50 to 70)% increased Spell Damage
(80 to 100)% increased Critical Strike Chance for Spells
+10 Life gained on Kill
+5 Mana gained on Kill
10% increased Radius of Area Skills
Divine intervention feels better when you do it yourself.
10.47%
BrightbeakBrightbeak
War Hammer
One Handed Mace
Physical Damage: (18–42 to 21–49)
Critical Strike Chance: 6.25%
Attacks per Second: 2.1
Requires Level 20, 71 Str
20% increased Stun Duration on enemies(50 to 75)% increased Physical Damage
50% increased Attack Speed
25% increased Critical Strike Chance
+(20 to 30)% to Fire Resistance
+(20 to 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
One Handed Mace
Physical Damage: (96–158 to 116–218)
Critical Strike Chance: 6%
Attacks per Second: (1.55 to 1.61)
Requires Level 75, 113 Str, 113 Int
10% increased Elemental DamageSocketed Gems are Supported by level 20 Elemental Proliferation
Adds (65–100 to 85–160) Physical Damage
(11 to 15)% increased Attack Speed
(6 to 10)% increased Cast Speed
(30 to 40)% increased Global Critical Strike Chance
0.2% of Elemental Damage Leeched as Life
(80 to 100)% increased Elemental Damage
The result of the catalystic 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
Staff
Physical Damage: (245–311 to 255–341)
Critical Strike Chance: (7.92 to 8.58)%
Attacks per Second: (1.4 to 1.45)
Requires Level 68, 113 Str, 113 Int
12% Chance to Block6% Chance to Block
Adds (180–190 to 190–220) Physical Damage
(12 to 16)% increased Attack Speed
(20 to 30)% increased Critical Strike Chance
+1 maximum Power Charge
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 Handed Sword
Physical Damage: (52–107 to 72–122)
Critical Strike Chance: 5%
Attacks per Second: (1.80 to 1.88)
Requires Level 66, 104 Str, 122 Dex
18% increased Accuracy RatingAdds (20–55 to 40–70) Physical Damage
(20 to 25)% increased Attack Speed
+(180 to 200) to Accuracy Rating
+(180 to 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
Wand
Critical Strike Chance: (9.60 to 10.40)%
Attacks per Second: (1.43 to 1.54)
Requires Level 65, 212 Int
(16 to 19)% increased Spell DamageNo Physical Damage
(10 to 18)% increased Attack Speed
+(340 to 400) to Accuracy Rating
(20 to 30)% increased Critical Strike Chance
Attacks with this Weapon have (100 to 115)% increased Elemental Damage
"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 Handed Mace
Physical Damage: 37–76
Critical Strike Chance: 100.00%
Attacks per Second: 0.63
Requires Level 40, 131 Str
20% 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
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.