Cast when Damage Taken Support

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Cast when Damage Taken SupportSupport, Spell, Trigger
Icon: !
Can store 1 use(s)
Cooldown Time: 0.25 sec
Drop Level: 38
Requires Level 38
Per 1% Quality:
0.5% increased Damage
Casts Supported Spells when you take a total of (528 to 3272) Damage
(-70 to 6)% more Damage
This Gem can only Support Skill Gems requiring Level (38 to 70) or lower
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 when Damage Taken Support inventory icon.png

Cast when Damage Taken is a support gem. It causes a linked spell to trigger when the player takes a certain amount of damage.

Skill Functions and Interactions

Trigger gem - Like all trigger gems, Cast when Damage Taken only "casts" spells. Attack gems such as Double Strike are not considered spells. Multiple spells can be linked to a single trigger gem and will all be triggered if so, there is one exception to this: if two or more spells of the same type are linked (e.g.: Cast when Damage Taken - Fireball - Fireball) they will never trigger simultaneously, even if they are not on the same link.

Trigger order - Trigger gems and their linked skills are cast in a certain order that depends both on which item it is equipped on and which socket the skills are in. If there are trigger gems in each equipped item, the order of operation will be:

Main hand ⇒ Amulet ⇒ Helm ⇒ Off hand ⇒ Body armour ⇒ Gloves ⇒ Boots

The linked sockets also follows a specific order as well, which is:

1 2
4 3
5 6

Damage counter and cooldown - Each linked skill has an internal damage counter that tracks the total accumulated damage taken from hits, but not from damage over time or the Blood Magic passive[1] (e.g. you cannot use Righteous Fire inventory icon.pngRighteous FireRighteous FireSpell, AoE, Fire
Radius: 14
Cast Time: 1.00 sec
Drop Level: 16
Requires Level 16
Engulfs you in magical fire that rapidly burns you and nearby enemies. Your spell damage is substantially increased while under this effect. The effect ends when you have 1 life remaining.Per 1% Quality:
1% increased Spell Damage
(40 to 59)% more Spell Damage
Enemies Burn for 50.0% of your maximum Life per second as Fire Damage
You Burn for 90.0% of your maximum Life per second as Fire Damage
Enemies Burn for 50.0% of your maximum Energy Shield per second as Fire Damage
You Burn for 70.0% of your maximum Energy Shield per second as Fire Damage
Place into an item socket of the right colour to gain this skill. Right click to remove from a socket.
Righteous Fire inventory icon.pngRighteous Fire skill icon.png
to trigger Cast when Damage Taken). All damage counters will be reset to 0 upon entering a new area. When a linked skill is cast, its damage counter will go on cooldown for 250 ms and will not track damage during that time.

The CWDT gem itself does not have its own counter or cooldown[2].

Damage effectiveness - The damage effectiveness increases with level, but so does the damage taken per cast; overall, the amount of damage that needs to be taken per damage effectiveness goes up at higher gem levels. The optimum is a level 2 gem, which requires 1442 damage taken per 100% damage effectiveness. In comparison, a level 20 gem requires 3057 damage taken per 100% damage effectiveness.

Targeting - Targeted spells will cast towards the enemy that caused the last damage. Reflected damage is considered to come from the enemy originally damaged.

Maximum level of supported skills - Cast when Damage Taken cannot support skills of higher level than specified. Note that this restriction only applies to active skills; any level of supports may be used.

Totems - Cast when Damage Taken can't be used with totems.

Gem level progression

LevelLvl.strengthintelligenceDamage
Threshold
less/more
Damage
maximum
Item
Level
Exp.Total Exp.
138402752870% less3800
240412958366% less40388,734388,734
342433066162% less42477,437866,171
444453172558% less44583,7861,449,957
546473381254% less46710,3592,160,316
648493489750% less481,355,5113,515,827
7505135100346% less501,138,8774,654,704
8525337110742% less521,368,2336,022,937
9545538122138% less541,638,3387,661,275
10565739135434% less561,956,6489,617,923
11585841148530% less583,655,18413,273,107
12606042163526% less603,017,32716,290,434
13626243180422% less623,576,23219,866,666
14646444198018% less644,231,66724,098,333
15656545218414% less652,395,07826,493,411
16666646239410% less668,421,06334,914,474
1767674626216% less6716,159,98351,074,457
1868684728742% less6841,170,36792,244,824
1969694831422% more6986,794,448179,039,272
2070704832726% more70157,405,063336,444,335
21727250358010% more72N/AN/A
2274N/AN/A395014% more74N/AN/A
2376N/AN/A435018% more76N/AN/A
2478N/AN/A478022% more78N/AN/A
2580N/AN/A524026% more80N/AN/A
2682N/AN/A573030% more82N/AN/A
2784N/AN/A625034% more84N/AN/A
2886N/AN/A680038% more86N/AN/A
2988N/AN/A738042% more88N/AN/A
3090N/AN/A799046% more90N/AN/A

Quest reward

This skill is given as quest reward for the following quests:
ClassMarauderTemplarWitchShadowRangerDuelistScion
Quest
Sharp and Cruel
Act 2
Cruel
yes
yes
no
no
no
yes
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

Due to the large amount of damage taken needed per damage effectiveness and the rapid scaling of damage taken required per level, it is advisable to use spells for purposes other than damage that do not depend heavily on the active skill level. Possible choices include:

  • Frost Wall inventory icon.pngFrost WallFrost WallSpell, Duration, Cold
    Mana Cost: (14 to 37)
    Can store 3 use(s)
    Cooldown Time: 3.00 sec
    Cast Time: 0.50 sec
    Drop Level: 4
    Requires Level 4
    Creates a wall of ice which holds back enemies. Targets under the wall are damaged and pushed back.Per 1% Quality:
    1% increased Duration
    Base duration is (3.0 to 4.9) seconds
    0.15 seconds between appearance of Wall sections
    Wall will be (28 to 56) units long
    Deals (8 to 462)-(12 to 693) Cold Damage
    Place into an item socket of the right colour to gain this skill. Right click to remove from a socket.
    Frost Wall inventory icon.pngFrost Wall skill icon.png
    to block enemies.
  • Arctic Breath inventory icon.pngArctic BreathArctic 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
    to create ground ice.
  • Passive corpse disposal/minion buffing via Detonate Dead inventory icon.pngDetonate DeadDetonate DeadCast, AoE, Fire
    Radius: 22
    Mana Cost: (7 to 30)
    Cast Time: 0.80 sec
    Critical Strike Chance: 5.00%
    Drop Level: 4
    Requires Level 4
    Explodes an unused corpse, dealing fire damage to nearby enemies.Per 1% Quality:
    1% increased Cast Speed
    Explosion deals base Fire Damage equal to 6% of the corpse's maximum Life
    Deals (4 to 276)-(5 to 414) Fire Damage
    Damage cannot be Reflected
    Place into an item socket of the right colour to gain this skill. Right click to remove from a socket.
    Detonate Dead inventory icon.pngDetonate Dead skill icon.png
    , Flesh Offering inventory icon.pngFlesh OfferingFlesh OfferingMinion, Spell, Duration
    Mana Cost: (16 to 33)
    Cast Time: 1.00 sec
    Drop Level: 12
    Requires Level 12
    Consumes a corpse, which temporarily empowers your minions with swiftness. The skill consumes other nearby corpses, increasing the duration for each corpse consumed.Per 1% Quality:
    0.5% increased Duration
    Base duration is 3.0 seconds
    Grants Minions (20 to 30)% increased Attack Speed
    Grants Minions (20 to 29)% increased Movement Speed
    Grants Minions (20 to 30)% increased Cast Speed
    Additional 0.5 seconds Base Duration per extra Corpse consumed
    Place into an item socket of the right colour to gain this skill. Right click to remove from a socket.
    Flesh Offering inventory icon.pngFlesh Offering skill icon.png
    , or Bone Offering inventory icon.pngBone OfferingBone OfferingMinion, Spell, Duration
    Mana Cost: (16 to 33)
    Cast Time: 1.00 sec
    Drop Level: 12
    Requires Level 12
    Consumes a corpse, granting all of your minions the power to block both attacks and spells. The skill consumes other nearby corpses, increasing the duration for each corpse consumed.Per 1% Quality:
    0.5% increased Duration
    Base duration is 3.0 seconds
    Grants Minions +(25 to 35)% Chance to Block Attacks
    Grants Minions +(25 to 34)% Chance to Block Spells
    Additional 0.5 seconds Base Duration per extra Corpse consumed
    Minions recover (11 to 594) Life when they Block
    Place into an item socket of the right colour to gain this skill. Right click to remove from a socket.
    Bone Offering inventory icon.pngBone Offering skill icon.png
    .
  • Lightning Warp inventory icon.pngLightning WarpLightning WarpSpell, AoE, Duration, Movement, Lightning
    Radius: 16
    Mana Cost: (15 to 33)
    Cast Time: 1.00 sec
    Critical Strike Chance: 5.00%
    Damage Effectiveness: 60%
    Drop Level: 10
    Requires Level 10
    Casts a delayed teleport to a target destination. When the teleport occurs, lightning damage is dealt to the area around both where the player was and where they teleported to.Per 1% Quality:
    1% increased Cast Speed
    Deals (1 to 37)-(19 to 707) Lightning Damage
    (0 to 38)% reduced Duration
    Place into an item socket of the right colour to gain this skill. Right click to remove from a socket.
    Lightning Warp inventory icon.pngLightning Warp skill icon.png
    to escape melee range. (Could backfire.)
  • Curses. This can be a reliable way of automatically casting curses, at the cost of lower curse level.

Some supports also potentially combine well, especially with a persistent rapid-firing skill such as Ball Lightning inventory icon.pngBall LightningBall 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
:

  • Blind Support inventory icon.pngBlind SupportBlind SupportSupport
    Icon: x
    Drop Level: 8
    Requires Level 8
    Per 1% Quality:
    1% increased Blinding duration
    10% chance to Blind enemies on hit
    (0 to 38)% increased Blinding duration
    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.
    Blind Support inventory icon.png
  • Chance to Flee Support inventory icon.pngChance to Flee SupportChance to Flee SupportSupport
    Icon: z
    Drop Level: 8
    Requires Level 8
    Per 1% Quality:
    1% chance to Cause Monsters to Flee
    (25 to 44)% chance to Cause Monsters to FleeThis 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.
    Chance to Flee Support inventory icon.png
  • Passive IIR culling via Culling Strike Support inventory icon.pngCulling Strike SupportCulling Strike SupportSupport
    Icon: X
    Mana Multiplier: 110%
    Drop Level: 18
    Requires Level 18
    Per 1% Quality:
    0.5% increased Attack Speed
    0.5% increased Cast Speed
    Kills Enemies on 10% Life or less when hit by supported Skills
    (0 to 38)% increased 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.
    Culling Strike Support inventory icon.png
    , Item Rarity Support inventory icon.pngItem Rarity SupportItem Rarity SupportSupport
    Icon: R
    Drop Level: 31
    Requires Level 31
    Per 1% Quality:
    0.5% increased Rarity of Items Dropped by Slain Enemies
    (40 to 59)% increased Rarity of Items Dropped by Slain EnemiesThis 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.
    Item Rarity Support inventory icon.png
    , and a skill that causes many hits.
  • Curse On Hit Support inventory icon.pngCurse On Hit SupportCurse On Hit SupportCurse, Trigger, Support
    Icon: &
    Drop Level: 38
    Requires Level 38
    Per 1% Quality:
    0.5% increased Effect of Supported Curses
    Supported Skills apply supported Curses on Hit
    (50 to 12)% reduced Curse Duration
    You cannot Cast Supported Curses
    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.
    Curse On Hit Support inventory icon.png
  • Knockback Support inventory icon.pngKnockback SupportKnockback SupportSupport
    Icon: k
    Drop Level: 8
    Requires Level 8
    Per 1% Quality:
    0.5% chance to Knock Enemies Back on hit
    (25 to 44)% chance to Knock Enemies Back on hit
    50% increased Knockback Distance
    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.
    Knockback Support inventory icon.png
  • Power Charge On Critical Support inventory icon.pngPower Charge On Critical SupportPower Charge On Critical SupportSupport
    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 Support inventory icon.png

Cats when Damage Taken

Cats when Damage Taken was a trigger gem available only on April 1st 2015. It was a bug caused by a typo in source code[3]. Like Cast when Damage Taken, it caused a linked spell to activate when the player accumulated damage taken, but besides casting the spell, it also summoned black cats. Other properties were identical to the Cast when Damage Taken skill.

Cats spawned by Cats when Damage Taken

Version history

Version Changes
2.0.0
  • Enduring Cry is now a Warcry instead of a spell, therefore it can't be cast anymore.
1.3.1g
  • Fixed a bug with the trigger gems that cause spells to automatically cats on various conditions.
1.3.1
  • Spells triggered by Cast on Damage Taken have had their damage reduced by 25%.
1.3.0
  • Trigger gems are now classified as Trigger.
1.2.2
  • Gems may now only be supported by a single trigger gem, gems supported by multiple trigger gems will be disabled.
1.0.1
  • The level requirement of gems augmented by Cast on Damage Taken may not exceed the level requirement of the Cast on Damage Taken gem.
1.0.0f
  • Cooldown of 250ms added.
1.0.0
  • Cast when Damage Taken has been added to the game.

See also

  • Cast on Death Support inventory icon.pngCast on Death SupportCast on Death SupportSupport, Spell, Trigger
    Icon: !
    Drop Level: 38
    Requires Level 38
    Per 1% Quality:
    3% increased Area of Effect radius while Dead
    100% chance to Cast Supported Non-Minion Spells on Death
    (0 to 304)% more Damage while Dead
    Supported Spells can only be Cast on Death
    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 Death Support inventory icon.png
  • Cast On Critical Strike Support inventory icon.pngCast On Critical Strike SupportCast On Critical Strike SupportSupport, 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 Support inventory icon.png
  • Cast on Melee Kill Support inventory icon.pngCast on Melee Kill SupportCast on Melee Kill SupportSupport, Melee, Attack, Spell, Trigger
    Icon: &
    Mana Multiplier: 140%
    Drop Level: 38
    Requires Level 38
    Per 1% Quality:
    0.5% increased Damage
    Supported Melee Attacks will Cast Supported Spells on Kill
    Supported Triggered Spells have (40 to 78)% increased Spell Damage
    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 Melee Kill Support inventory icon.png

References

  1. Mark_GGG (9 October 2013). "Path of Exile Forum". Retrieved 2 July 2015.
  2. Mark_GGG (May 20, 2014). "Path of Exile Forum".
  3. Chris (April 1, 2015). "Incident Report for April 1 Catastrophe". Retrieved April 1, 2015.