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Cast when Damage Taken

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Cast when Damage Taken
Trigger gem
 
Attribute(s)Strength, Intelligence
KeywordsSupport, Spell, Trigger
Required Level38
Cooldown Time250ms
Per 1% Quality0.5% increased Damage
This Gem can only Support Skill Gems requiring Level x or lower
x% less Damage
You cannot Cast Supported Spells directly
100% chance to Cast Supported Spells when you take a total of x Damage


Cast when Damage Taken is a trigger gem. It causes a linked spell to activate when the player accumulates damage taken.

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 but if two or more spells are of the same type (e.g.: Cast when Damage Taken - Fireball - Fireball) they will never trigger simultaneously, even if they are not on the same link. The order in which they are linked determines the order in which they cast. The top end of the linked sockets (for four-links, the top left socket) is the first in the order, followed by each socket down the line, following links.

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 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. Furthermore, Cast when Damage Taken has its own cooldown of 250 ms, and a linked skill can only be cast when both its own damage counter and Cast when Damage Taken are not on cooldown. This can cause skills intended to be simultaneous to get out of sync.

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.

Gem level progression

Level Lvl. Str. Int. Damage
Threshold
less
Damage
maximum
Item
Level
Exp. Total Exp.
1 38 40 27 528 70% 38 0 0
2 40 41 29 583 66% 40 388,734 388,734
3 42 43 30 661 62% 42 477,437 866,171
4 44 45 31 725 58% 44 583,786 1,449,957
5 46 47 33 812 54% 46 710,359 2,160,316
6 48 49 34 897 50% 48 1,355,511 3,515,827
7 50 51 35 1003 46% 50 1,138,877 4,654,704
8 52 53 37 1107 42% 52 1,368,233 6,022,937
9 54 55 38 1221 38% 54 1,638,338 7,661,275
10 56 57 39 1354 34% 56 1,956,648 9,617,923
11 58 58 41 1485 30% 58 3,655,184 13,273,107
12 60 60 42 1635 26% 60 3,017,327 16,290,434
13 62 62 43 1804 22% 62 3,576,232 19,866,666
14 64 64 44 1980 18% 64 4,231,667 24,098,333
15 65 65 45 2184 14% 65 2,395,078 26,493,411
16 66 66 46 2394 10% 66 8,421,063 34,914,474
17 67 67 46 2621 6% 67 16,159,983 51,074,457
18 68 68 47 2874 2% 68 41,170,367 92,244,824
19 69 69 48 3142 2% 69 86,794,448 179,039,272
20 70 70 48 3272 6% 70 157,405,063 336,444,335
21 72 72 50 3580 10% 72 N/A N/A
22 74 3950 14% 74 N/A N/A
23 76 4350 18% 76 N/A N/A
24 78 4780 22% 78 N/A N/A
25 80 5240 26% 80 N/A N/A
26 82 5730 30% 82 N/A N/A
27 84 6250 34% 84 N/A N/A
28 86 6800 38% 86 N/A N/A
29 88 7380 42% 88 N/A N/A
30 90 7990 46% 90 N/A N/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
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:

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


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[2]. 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 casted 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

References

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