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Cast when Damage Taken

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Cast when Damage Taken
Trigger gem
 
Attribute(s)Strength, Intelligence
KeywordsSupport, Spell
Required Level31
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 (e.g.: Cast when Damage Taken - Enduring Cry - Immortal Call will cast Enduring Cry first, allowing Immortal Call to consume the charges immediately. In the other order, Immortal Call with consume existing charges, then new charges will be produced by Enduring Cry). 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 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.

Cooldown: Cast when Damage Taken has a cooldown of 250ms, or the linked skill's cooldown, whichever is longer. Each linked spell has its own cooldown and internal damage counter. The damage counter will not increase while the spell is cooling down. This can cause skills intended to be simultaneous to get out of sync (e.g. Immortal Call will keep counting damage while Enduring Cry is on cooldown, so they will end up going off at different times).

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.

Damage Counter Reset: The counter of damage taken will reset to 0 whenever you enter a new area. Damage taken is not remembered when returning to the same instance of an area.

Gem level progression

Level Lvl. Str. Int. x% less
Damage
Total
Damage
Maximum Level of
Supported Skills
Exp.
1 31 33 23 70% 440 31 179,320
2 33 35 24 66% 490 33 225,766
3 35 37 25 62% 560 35 282,073
4 37 39 27 58% 620 37 349,759
5 39 40 28 54% 700 39 431,204
6 41 42 29 50% 780 41 528,465
7 43 44 31 46% 880 43 644,165
8 45 46 32 42% 980 45 782,325
9 47 48 33 38% 1090 47 945,554
10 49 50 35 34% 1220 49 1,138,877
11 51 52 36 30% 1350 51 1,368,223
12 53 54 37 26% 1500 53 1,638,338
13 55 56 39 22% 1670 55 1,956,648
14 57 57 40 18% 1850 57 2,329,968
15 59 59 41 14% 2060 59 9,826,462
16 61 61 43 10% 2280 61 21,126,787
17 63 63 44 6% 2520 63 50,254,966
18 65 65 45 2% 2790 65 89,391,985
19 67 67 46 -2% 3080 67 146,266,188
20 69 69 48 -6% 3240 69 N/A
21 71 71 49 -10% 3580 71 N/A
22 73? 73?  ? -14% 3950 73 N/A

Quest reward

This skill can be gained as a reward for finishing quests:

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:

Version history

Version Changes
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.