Cast when Damage Taken Support

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 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 (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

Template:GemLevelTable |- ! 1 | 38 || 39 || 27 || 70% || 528 || 38 || 388,734 |- ! 2 | 40 || 41 || 29 || 66% || 583 || 40 || 477,437 |- ! 3 | 42 || 43 || 30 || 62% || 661 || 42 || 583,786 |- ! 4 | 44 || 45 || 31 || 58% || 725 || 44 || 710,359 |- ! 5 | 46 || 47 || 33 || 54% || 812 || 46 || 1,355,511 |- ! 6 | 48 || 49 || 34 || 50% || 897 || 48 || 528,465 |- ! 7 | 50 || 51 || 35 || 46% || 1003 || 50 || 644,165 |- ! 8 | 52 || 53 || 37 || 42% || 1107 || 52 || 782,325 |- ! 9 | 54 || 55 || 38 || 38% || 1221 || 54 || 945,554 |- ! 10 | 56 || 57 || 39 || 34% || 1354 || 56 || 1,138,877 |- ! 11 | 58 || 58 || 41 || 30% || 1485 || 58 || 1,368,223 |- ! 12 | 60 || 60 || 42 || 26% || 1635 || 60 || 1,638,338 |- ! 13 | 62 || 62 || 43 || 22% || 1804 || 62 || 1,956,648 |- ! 14 | 64 || 64 || 44 || 18% || 1980 || 64 || 2,329,968 |- ! 15 | 65 || 65 || 45 || 14% || 2184 || 65 || 9,826,462 |- ! 16 | 66 || 66 || 46 || 10% || 2394 || 66 || 21,126,787 |- ! 17 | 67 || 67 || 46 || 6% || 2621 || 67 || 50,254,966 |- ! 18 | 68 || 68 || 47 || 2% || 2874 || 68 || 89,391,985 |- ! 19 | 69 || 69 || 46 || -2% || 3142 || 69 || 146,266,188 |- ! 20 | 70 || 70 || 48 || -6% || 3272 || 70 || class="table-na" style="text-align: center; " | N/A |- ! 21 | 71 || 71 || 48 || -10% || 3580 || 71 || class="table-na" style="text-align: center; " | N/A |- ! 22 | 73? || 73? || ? || -14% || 3950 || 73 || class="table-na" style="text-align: center; " | N/A |}

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:

• to block enemies.
• to create ground ice.
• Passive corpse disposal/minion buffing via , , or Bone Offering.
• 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 :

• Passive IIR culling via , , and a skill that causes many hits.

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. 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
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.