
Cast when Damage Taken
Cast when Damage Taken is a support gem. It causes a linked spell to trigger when the player takes a certain amount of damage. Cats when Damage Taken was a trigger gem available only on April 1, 2015 as an April Fool's joke. 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. 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.
Amount | Ingredient | General Notes | Type |
---|---|---|---|
9 | Gift of the Gemling QueenGift of the Gemling Queen9Level 20 Support GemOur Lady Dialla, as a symbol of our progress, shines greater than all the gems. | random level 20 Support gem | Automatic |
7 | Dialla's SubjugationDialla's Subjugation7Superior Support Gem Quality: +23% CorruptedA symbol of beauty and innocence The gems corrupted her mind Malachai corrupted her gems All but a glimmer of greatness lost in madness | random corrupted superior Support gem with 23% quality | Automatic |
8 | Dying AnguishDying Anguish8Level 19 Gem Alternative Quality: +19%Moribund, he gazed upon the journey taken as blood trickled down his chin. His eye closed on the city ahead that he would never call home. | random level 19 gem with 19% alternative quality | Automatic |
1 | Gemcutter's IncubatorGemcutter's IncubatorAdds an incubated Quality Gem item to an equippable item Item drops after killing # monstersQuality GemRight click this item then left click an item to apply it. The Incubated item drops after killing a specific number of monsters. | random superior gem | Automatic |
6 | The FoxThe Fox6Level 20 Gem"Masters of wit, strength and cunning. To survive the harsh winters, you must be like the fox." - Ezomyte Proverb | random level 20 gem | Automatic |
13 | The CataclysmThe Cataclysm13Level 21 Spell Gem CorruptedThe mighty warriors traded in blows, the nimble archers in arrows, yet it was the brazen thaumaturgists who would bring catastrophe to all. | random corrupted level 21 Spell gem | Automatic |
3 | Gemcutter's PromiseGemcutter's Promise3Superior Gem Quality: +20%"I swore to use my position to help the people. What good is power when it just accumulates on the already-powerful?" - Erasmus, Imperial Gemcutter | random superior gem with 20% quality | Automatic |
1 | The VoidThe Void1Reach into the Void and claim your prize. | random divination card set exchange | Automatic |
Icon: !
Level: (1-20)
Cost & Reservation Multiplier: 250%
Cooldown Time: 0.25 sec
Can Store 1 Use(s)Requires Level 38Each supported spell skill will track damage you take, and be triggered when the total damage taken reaches a threshold. Cannot support skills used by totems, traps, or mines. Vaal skills, channelling skills, and skills with a reservation cannot be triggered.Per 1% Quality:1Superior2Anomalous3DivergentSupported Skills deal 0.5% increased DamageSupported Skills have 1% increased Skill Effect DurationSupported Skills require 1% reduced amount of Damage taken to TriggerTrigger Supported Spells when you take a total of (528-3272) Damage
Supported Skills deal (-70-6)% more Damage
This Gem can only Support Skill Gems requiring Level (38-70) or lower
You cannot Cast Supported Triggerable Spells directlyThis is a Support Gem. It does not grant a bonus to your character, but to 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.

Area level: 38Vendor Prices
Normal | 1x Orb of Alchemy |
1x Scroll FragmentMetadata
Item class: Support Skill Gems
Metadata ID: Metadata/Items/Gems/SupportGemCastOnDamageTaken
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. Multiple copies of Cast when Damage Taken will also function independently.
Damage counter and cooldown: Each linked spell gains an internal damage counter that tracks the total accumulated damage taken from hits, though not from damage over time or the Blood Magic passive (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 spell is cast, it is put on cooldown for 250 ms and will not track damage during that time. Multiple copies of the same gem share cooldowns, meaning that if two copies of the same spell are triggered within 250 ms of each other, the first will trigger and the second will fail to do so as it is on cooldown. This mostly prevents using multiple copies of the same spell with Cast when Damage Taken, though the use of Cast when Damage Taken gems of different levels can avoid cooldown overlap in some circumstances due to the differing amounts of damage required to trigger the spells. The Cast when Damage Taken gem itself does not have its own counter or cooldown.
Damage taken: The damage taken is applied after mitigations so armour, resistances, and less damage taken of "X" will reduce the number of procs. The damage does not have to apply to life though so damage to ES, mana (through Mind Over Matter), ward, Guard Skills, or other shields like Aegis all count. Shields from other sources such as Frost Shield will not count nor does Immortal Call since it reads as less damage taken.
Maximum level of supported skills: Cast when Damage Taken cannot support skills with a higher player level requirement than that of Cast when Damage Taken itself. Note that this restriction only applies to active skills; any level of other support gems may be used.
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.
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. This does not, however, take into account the increase in damage from being able to use a higher level gem; for instance, a level 4 Bladefall gem deals an average of 91.5 damage, while a level 20 gem deals an average of 475. On a strict damage-in-per-damage-out basis, Cast when Damage Taken roughly triples in power between level 1 and level 20, depending on the skill used. Any flat added damage will affect this ratio—the more damage added, the less effective it is to level up the Cast when Damage Taken gem.
Targeting: Targeted spells will cast towards the enemy that caused the last damage. Reflected damage is considered to come from the enemy originally damaged. If the damage was self-caused, it will target a random enemy (if there are no enemies, it will be cast at the player, if it is a projectile, it will be fired in a random direction).
Totems: Cast when Damage Taken can't be used with totems.
Buy Cast when Damage Taken Products
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