Cast when Damage Taken Support
Support, Spell, Trigger
Level: 1–20
Cost & Reservation Multiplier: 250%
Cooldown Time: 0.25 sec
Requires Level 38
Each 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.
This Gem can only Support Skill Gems requiring Level (38–70) or lower
Supported Skills deal (27–65)% less Damage
You cannot Cast Supported Triggerable Spells directly
Trigger Supported Spells when you take a total of (528–3272) Damage


Additional Effects From Quality:
Supported Skills deal (0–10)% increased Damage
This 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.
Unusual Gems /3

Unusual Gems /3

TypeStatsWeight
Superior Supported Skills deal (0–10)% increased Damage50
Anomalous Supported Skills have (0–20)% increased Skill Effect Duration100
Divergent Supported Skills require (0–20)% reduced amount of Damage taken to Trigger20
Quest /1

Quest /1

ActQuest CompleteNPCCharacter
4The Eternal NightmarePetarus and VanjaAll Classes
Cast when Damage Taken Support /1

Cast when Damage Taken Support /1

NameShow Full Descriptions
Steelskin
Strengthen your defense, greatly reducing damage taken from hits for a short duration. Steelskin is a Guard utility skill that blocks an amount of damage. Once depleted, the damage will go through to you. Guard skills do not benefit much from support gems, and Steelskin can be used well without supports.
Automatically cast Steelskin after taking damage. This is valuable for defending against surprise attacks. Steelskin can not be cast manually with this gem, and cannot be used to defend against a monster about to hit you. It's important to have another way to defend against monsters if you use this gem.
Level Effect /40

Level Effect /40

Implicit
Cost & Reservation Multiplier: 250%
You cannot Cast Supported Triggerable Spells directly
LevelRequires LevelStrengthIntelligenceTrigger Supported Spells when you take a total of 528 DamageSupported Skills deal 65% less DamageThis Gem can only Support Skill Gems requiring Level 38 or lowerExperience
1384027100, 5286538388,734
2404129100, 5836340477,437
3424330100, 6616142583,786
4444531100, 7255944710,359
5464733100, 81257461,355,511
6484934100, 89755481,138,877
7505135100, 100353501,368,233
8525337100, 110751521,638,338
9545538100, 122149541,956,648
10565739100, 135447563,655,184
11585840100, 148545583,017,327
12606042100, 163543603,576,232
13626243100, 180441624,231,667
14646444100, 198039642,395,078
15656545100, 218437658,421,063
16666646100, 2394356616,159,983
17676746100, 2621336741,170,367
18686847100, 2874316886,794,448
19696948100, 31422969157,405,063
20707048100, 32722770
2172100, 35802572
2274100, 39502374
2376100, 43502176
2478100, 47801978
2580100, 52401780
2682100, 57301582
2784100, 62501384
2886100, 68001186
2988100, 7380988
3090100, 7990790
3191100, 8310691
3292100, 8630592
3393100, 8965493
3494100, 9300394
3595100, 9650295
3696100, 10000196
3797100, 1036597
3898100, 10730198
3999100, 11110299
40100100, 114903100

Cast when Damage Taken Support

Referencepoe.ninja, Community Wiki
AcronymTrigger
DropLevel 38
BaseType Cast when Damage Taken Support
Class Support Skill Gems
Icon!
MetadataMetadata/Items/Gems/SupportGemCastOnDamageTaken
Microtransactions /1 ⍟

Microtransactions /1 ⍟

IconName
Madcap Cast when Damage Taken Effect
Your Cast when Damage Taken becomes a Madcap Effect.
Supported Gem /109 ⍟

Supported Gem /109 ⍟

Active Skill GemDescription
FireballUnleashes a ball of fire towards a target which explodes, damaging nearby foes.
Ice NovaA chilling circle of ice expands from the caster. If the caster targets near their Frostbolt projectiles, it will expand from a number of those projectiles instead. If this skill would repeat when cast this way, it will instead expand again from the same projectiles after a short delay.
Immortal CallTake less Physical and Elemental Damage for a short time. Consumes up to 5 Endurance Charges to lengthen the buff and further lessen Physical Damage taken. Shares a cooldown with other Guard skills.
Cold SnapCreates a sudden burst of cold in a targeted area, damaging enemies. This also creates an expanding area which is filled with chilled ground, and deals cold damage over time to enemies. Enemies that die while in the area have a chance to grant Frenzy Charges. The cooldown can be bypassed by expending a Frenzy Charge.
Raise ZombieRaises a zombie minion from a corpse, which will follow you and attack enemies with a melee attack and an area of effect slam which cannot be evaded.
Detonate DeadTargets a corpse, and deals spell damage to enemies around the corpse, as well as causing the corpse to explode, dealing fire damage. The explosion is not affected by modifiers to spell damage and cannot be reflected.
Volatile DeadCorpses near the targeted location explode, dealing damage in a small area and creating an orb which moves towards nearby enemies before dealing spell damage in a larger area. The explosion of the corpse is not affected by modifiers to spell damage, and cannot be reflected.
UnearthFires a projectile that will pierce through enemies to impact the ground at the targeted location, creating a Bone Archer corpse where it lands.
Creeping FrostFire an icy projectile that bursts on impact or when reaching the targeted area, dealing area damage and creating a chilling area that deals cold damage over time. This area will creep across the ground towards nearby enemies until its duration expires.
Blood RageAdds a buff that deals Physical Damage over time, while increasing Attack Speed and Life Leech. Killing an enemy while this buff is active refreshes the buff duration, and can grant a Frenzy Charge.
Righteous FireEngulfs 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.
DischargeDischarge all the character's charges to deal elemental damage to all nearby monsters.
PortalCreates a portal to the current area's town.
SparkLaunches unpredictable sparks that move randomly until they hit an enemy or expire.
Ice SpearLaunches shards of ice in rapid succession. After travelling a short distance they change to a second form, which moves much faster and pierces through enemies.
Raise SpectreRaises a spectral version of a defeated foe as a minion to fight for you in battle.
Frost WallCreates a wall of ice which holds back enemies. Targets under the wall are damaged and pushed back.
Freezing PulseAn icy projectile which has a chance to freeze enemies it passes through. The projectile fades quickly, reducing damage and freezing chance until it dissipates.
Shock NovaCasts a ring of Lightning around you, followed by a larger Lightning nova. Each effect hits enemies caught in their area with Lightning Damage.
Phase RunGain a buff that makes you faster, harder to detect, and grants Phasing, letting you pass through enemies. Performing any skill replaces this buff with one that boosts melee physical damage of skills you use yourself (it will not apply to your melee skills used by totems). Consumes Frenzy Charges to increase duration.
Temporal ChainsCurses all enemies in an area, lowering their action speed and making other effects on them expire more slowly.
Elemental WeaknessCurses all targets in an area, lowering their elemental resistances.
Warlord's MarkCurses a single enemy, giving a chance to double the duration of stuns on them. Attacking the cursed enemy will leech life and mana, stunning them will grant rage, and killing it will grant an endurance charge. You can only have one Mark at a time.
PunishmentCurses all targets in an area, causing them to be debilitated when they hit enemies and increasing damage they take while on low life. Some overkill damage from a killing blow on a cursed enemy will be reflected to surrounding targets.
EnfeebleCurses all targets in an area, reducing their accuracy and making them deal less damage.
Assassin's MarkCurses a single enemy, making them more vulnerable to Critical Strikes. Killing the cursed enemy will grant life and mana, and a power charge. You can only have one Mark at a time.
Sniper's MarkCurses a single enemy, increasing the damage they take from projectiles, and making projectiles split when hitting them, to hit other targets around them. You can only have one Mark at a time.
DespairCurses all targets in an area, lowering their chaos resistance and increasing damage over time they take. All hits will deal added chaos damage to the cursed enemies.
Lightning WarpWaits for a duration before teleporting to a targeted destination, with the duration based on the distance and your movement speed. When the teleport occurs, lightning damage is dealt to the area around both where the player was and where they teleported to. Casting again will queue up multiple teleportations to occur in sequence.
Summon SkeletonsSummon Skeleton Warrior minions at the targeted location. They use a melee attack and die after a duration. If made aggressive, Skeleton Warriors will also dash towards nearby enemies.
FirestormFlaming bolts rain down over the targeted area. They explode when landing, dealing damage to nearby enemies.
Molten ShellApplies a buff that adds to your armour, and can take some of the damage from hits for you before being depleted. When the buff expires or is depleted, the skill deals reflected damage to enemies around you based on the total damage that was taken from the buff. Shares a cooldown with other Guard skills.
ArcAn arc of lightning stretches from the caster to a targeted enemy and chains on to other nearby enemies. Each time the main beam chains it will also chain to a second enemy, but that secondary arc cannot chain further.
Ethereal KnivesFires an arc of knives in front of the caster which deals physical damage.
FlammabilityCurses all targets in an area, lowering their fire resistance and giving them a chance to be ignited when hit.
FrostbiteCurses all targets in an area, lowering their cold resistance and giving them a chance to be frozen when hit.
ConductivityCurses all targets in an area, lowering their lightning resistance and giving them a chance to be shocked when hit.
Animate GuardianAnimates a melee weapon or armour, attaching it to an invisible Guardian that fights by your side. Animating multiple items attaches them to the same Guardian. You cannot animate unidentified items. Cannot be used by Traps or Mines.
Animate WeaponAnimates a Melee Weapon Item or Lingering Blade to fight by your side. You cannot animate unidentified Weapons. Will not animate weapons with 6 sockets unless specifically targeted. Cannot be used by Traps or Mines.
Storm CallSets a marker at a location. After a short duration, lightning strikes the marker, dealing damage around it. When this happens, it will also set off the lightning at any other markers you've cast.
Ball LightningFires a slow-moving projectile that periodically damages enemies in an area around it with bolts of lightning.
Summon Raging SpiritSummons a short-lived flaming skull that rushes at nearby enemies and attacks them rapidly. Enemies will not directly engage these spirits, and can pass through them.
Flame SurgeStrikes enemies in front of you with a surge of flame. Burning enemies are dealt more damage. If you hit an ignited enemy, will create burning ground under them. Your damage modifiers don't apply to this burning ground.
DesecrateDesecrates the ground, summoning corpses and dealing chaos damage to all enemies in the area. The corpses will be chosen from the monsters in the current area and any Spectres that have existed in this instance.
Flesh OfferingConsumes a corpse, which temporarily empowers your minions with swiftness. The skill consumes other nearby corpses, increasing the duration for each corpse consumed.
Bone OfferingConsumes 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.
Spirit OfferingConsumes a corpse, granting increased critical strike chance and additional critical strike multiplier to your minions. The skill consumes other nearby corpses, increasing the duration for each corpse consumed.
Glacial CascadeIcicles emerge from the ground in a series of small bursts, each damaging enemies caught in the area and knocking them back in the direction of the next burst.
ConvocationRecalls all minions that are following you to your location, and grants them a temporary life regeneration effect.
Poacher's MarkCurses a single enemy, lowering their physical damage reduction, and adding physical damage to all hits against them. Attacking the cursed enemy will grant life and mana, and killing them will grant a frenzy charge. You can only have one Mark at a time.
Summon Chaos GolemSummons a Chaos Golem that grants you Physical Damage Reduction. The Chaos Golem can use a damage over time Chaos aura and a cascade of Chaos spikes in addition to its melee attack.
Summon Ice GolemSummons an Ice Golem that grants you increased Critical Strike Chance and Accuracy. The Ice Golem can use an icy barrage spell and a chilling spinning dash in addition to its melee attack.
Summon Flame GolemSummons a Flame Golem that grants you increased Damage. The Flame Golem can use a fire spray, a wave of fire damage, and an explosive arcing projectile.
Summon Lightning GolemSummons a Lightning Golem that grants you increased Attack and Cast speed. The Lightning Golem fires a projectile spell, creates orbs of Lightning that zap nearby enemies, and casts a temporary aura that grants added Lightning Damage to spells and attacks used by the Golem and its nearby allies.
Detonate MinesDetonates a Mine, starting a Detonation Sequence which will detonate other Mines around it.
Flame DashTeleport to a location, damaging enemies and leaving a trail of burning ground in your wake. Shares a cooldown with other Blink skills.
Rolling MagmaLob a fiery orb that explodes as it hits the ground. The skill chains, releasing another fiery orb that repeats this effect.
BladefallEthereal weapons rain from the sky, dealing damage to enemies in a sequence of volleys, each wider but less damaging than the last. Enemies can be hit multiple times where these overlap.
Blade VortexThis spell creates ethereal blades which orbit in an area around you, dealing damage every 0.6 seconds to all enemies in their radius. As more blades are added, the damage becomes greater and more frequent.
Frost BombCreates a crystal that pulses with cold for a duration. Each pulse applies a debuff to nearby enemies for a secondary duration which reduces life and energy shield regeneration rate, and also inflicts Cold Exposure. When the crystal's duration ends, it explodes, dealing heavy cold damage to enemies around it.
Orb of StormsCreates a stationary electrical orb that strikes enemies in its area of effect with beams of lightning that can then split to hit more enemies. Modifiers to cast speed will increase how frequently it does this. Casting this skill again will replace the previous orb.
Summon Stone GolemSummons a Stone Golem that grants you life regeneration. In addition to its melee attack, the Stone Golem uses a rolling charge and a powerful slam that can taunt enemies.
ContagionUnleashes a vile contagion on enemies, dealing chaos damage over time. If an enemy dies while affected by Contagion, it spreads to other enemies.
Essence DrainFires a projectile that applies a damage over time debuff when it hits. You are healed for a portion of the debuff damage. The debuff is spread by Contagion.
FrostboltFires a slow-moving projectile that pierces through enemies, dealing cold damage.
VortexAn icy blast explodes around the caster, dealing cold damage to enemies, and leaving behind a whirling vortex which deals cold damage over time and chills enemies caught in it. If the caster targets near their Frostbolt projectiles, it will explode from a number of those projectiles instead, destroying them.
Dark PactThis spell removes some life from one of your Skeleton minions near you or the targeted location to deal chaos damage in an area around it. This effect will chain to your other nearby skeletons. If you have no skeletons near you or the targeted location, it will sacrifice your own life to deal damage instead.
CremationA targeted corpse explodes, dealing area damage and turning into a volcanic geyser, which will repeatedly unleash projectiles sequentially over the surrounding area for a duration. The explosion of the corpse is not affected by modifiers to spell damage, and cannot be reflected.
BodyswapViolently destroys your body and recreates it at the location of a targeted enemy or corpse, dealing spell damage in an area at both locations. If there is no specific target, it will prioritise corpses over enemies. If targeting a corpse, the corpse will also explode, dealing damage around it that is not affected by modifiers to spell damage, and cannot be reflected. This spell cannot be repeated.
VulnerabilityCurse all targets in an area, causing them to take increased physical damage. Attacks against the cursed enemies have a chance to inflict bleeding, and ailments inflicted on them will deal damage faster.
Summon Holy RelicSummon a Holy Relic that stays near you. When you hit an enemy with an attack, the Holy Relic triggers a nova spell, with a very short cooldown, that deals physical damage to enemies and grants life regeneration to allies. This life regeneration is higher when applied to minions.
Storm BrandCreates a magical brand which can attach to a nearby enemy. It periodically activates while attached, firing beams which deal damage to nearby enemies and those around them. The brand will detach if the enemy dies.
Armageddon BrandCreates a magical brand which can attach to a nearby enemy. It periodically activates while attached, causing a fiery meteor to fall from the sky. The brand will detach if the enemy dies.
Brand RecallRecall your brands to you, detaching them from enemies and increasing attachment range until they next attach to an enemy. Spends a portion of each recalled brand's cost to cause it to activate.
Purifying FlameA wave of divine fire deals damage in a line, then creates Consecrated Ground and deals damage in an area around the targeted location. A larger shockwave then expands outwards, damaging enemies standing on Consecrated Ground that were not already hit.
SoulrendFires a projectile that turns towards enemies in front of it, damaging and piercing through those it hits, and leeching some of that damage as energy shield. As the projectile travels, it repeatedly applies a short but powerful chaos damage over time debuff to each enemy in an area around it.
BaneApplies a debuff to enemies in an area, which deals chaos damage over Time. Linked hex curses are also applied to those enemies. The debuff deals more damage and lasts longer for each hex applied this way. This skill cannot be used by Totems, Traps, or Mines.
Wave of ConvictionAn expanding wave of energy surges forward, damaging enemies in a cone-shaped area over a duration. Each enemy hit is inflicted with Exposure matching the element of which they took the highest damage. Only one Wave of Conviction can be active at a time
SteelskinApplies a buff which can take some of the damage from hits for you before being depleted. Shares a cooldown with other Guard skills.
BerserkConsumes Rage at an accelerating rate to provide a powerful buff, granting more attack damage, attack speed, movement speed, and less damage taken.
FrostblinkTeleport to a location, damaging enemies and leaving Chilled ground in an area at both ends of the teleport. Shares a cooldown with other Blink skills.
Summon Carrion GolemSummons a Carrion Golem that grants added physical damage for your non-golem minions. The Carrion Golem attacks with a series of slashes that increase in speed and damage, as well as a cascade of bone spikes, and deals more damage for each of your non-golem minions near it.
Withering StepRemoves any existing Elusive buff before applying both Elusive and a buff that grants Phasing. While you have this buff, monsters that enter an area around you will be Withered. Using a skill or losing the Elusive buff ends this skill's effects. Shares a cooldown with other Blink skills.
Arcane CloakSpends a portion of your mana to grant a buff that takes some of the damage from hits for you until depleted. The buff grants added lightning damage based on the amount of mana spent by this skill. Shares a cooldown with other Guard skills.
Blade BlastDeals spell damage in a targeted area. When this spell deals damage, if your Lingering Blades or Blade Vortex blades are nearby, it will detonate them, dealing damage again in an area around them. Up to 50 Blades can be detonated this way.
Penance BrandCreates a magical brand which can attach to a nearby enemy. It periodically activates while attached, adding energy to the branded enemy. Each activation, energy spreads from each energised enemy to an enemy in range which is not energised by the brand. If the branded enemy has 20 energy, each activation will instead deal a pulse of area damage. Energy explodes when the energised enemy dies or the brand is removed, dealing damage in an area.
Wintertide BrandCreates a magical brand which can attach to a nearby enemy, dealing cold damage over time and chilling them. It periodically activates while attached, gaining stages that raise the damage. When removed, a short-duration debuff dealing the same damage over time and chill is applied to each nearby enemy. The brand keeps its charges while detached.
Blazing SalvoFires projectiles which fly in an arc, exploding on impact with either enemies or the ground near where you target. Targeting farther away causes the projectiles to spread out and land over a wider area.
Void SphereCreates a Void Sphere which Hinders enemies in an area around it, with the debuff being stronger on enemies closer to the sphere. It also regularly releases pulses of area damage. The Void Sphere will consume the corpses of any enemies which die in its area. Can only have one Void Sphere at a time.
Crackling LanceRelease a beam which deals lightning damage to enemies in a long area in front of you, and has several smaller beams branch off from it at an angle, hitting more enemies to the sides.
Frost ShieldPlace a Frost Shield that drains your energy shield for one second or until you run out, gaining stages while this drain occurs. The Frost Shield takes some damage from hits in place of you and allies while in its area. Enemies in the area are Chilled. You can only have one Frost Shield active at once.
Sigil of PowerPlaces a Sigil on the ground, which grants a buff to you and allies in the area around it for a duration. The Sigil gains stages as you spend mana in its area, making the buff more powerful. You can only have one Sigil of Power at a time.
Flame WallCreate a wall of fire for a duration, which deals burning damage to everything in its area. Each enemy that enters the wall also receives a secondary burning debuff which persists for a short duration after leaving the wall. Any projectiles fired through the wall by you and allies deal added fire damage and apply the wall's secondary debuff on hit.
HexblastDeals chaos damage to a single enemy, dealing more damage if they are Hexed, then removes the Hex with the highest Doom. If a Hex was removed this way, also deals area damage to other enemies around the target, boosting damage and removing Hexes from those enemies in the same way.
HydrosphereCreate a sphere of water, or move an existing sphere and reset its duration. The sphere continually applies a drenched debuff with a short duration to enemies in its area or those it moves through. You can hit the sphere with other skills to inflict Cold and Lightning Ailments (other than Chill). The sphere pulses when created, at regular intervals while afflicted by an Ailment, and after moving, damaging all drenched enemies in a large area.
ExsanguinateReleases several tendrils of blood from your character, targeting enemies in a narrow angle in front of you. The beams deal physical damage and inflict a physical damage over time debuff to enemies, which can stack up to 3 times. Effects which allow skills to chain can apply to these tendrils.
Corrupting FeverDraws out your own blood to power a buff for a duration, letting this skill inflict the Corrupting Blood debuff on enemies you hit, dealing physical damage over time for a short secondary duration. The buff's duration will be refreshed if you spend enough life before it expires.
ReapA bloody scythe swipes across a selected area, applying a physical damage over time debuff in addition to hitting enemies with physical damage. If enemies survive, you gain a blood charge which raises the damage and cost of the skill. Players can have 5 maximum blood charges.
Voltaxic BurstEach cast of this spell waits for a short duration, releasing a burst of lightning and chaos spell damage in an area around you when that duration ends. Enemies killed by this damage, or shortly after, will explode. The explosions of the corpses are not affected by modifiers to spell damage, and cannot be reflected.
AbsolutionDamages enemies in an area, applying a debuff for a short duration. If a non-unique enemy dies while affected by the debuff, the enemy's corpse will be consumed to summon a Sentinel of Absolution for a longer secondary duration, or to refresh the duration and life of an existing one instead if you have the maximum number of them.
AmbushTeleports you to a nearby enemy, applying a buff to you for a short duration and blinding the enemy for a secondary duration. Performing a melee attack with a One-Handed Weapon removes the buff to exert that attack.
Forbidden RiteLobs an exploding projectile near the targeted location, and extra projectiles toward enemies around you. The projectiles deal chaos damage based on your life and energy shield. Casting this spell damages you.
ManabondDeals lightning damage based upon your missing mana in a circular area around the targeted location, as well as in four rectangular extensions whose lengths depend upon your remaining mana.
Summon ReaperSummons a powerful Reaper which uses a variety of slashing area attacks. The Reaper's presence weakens your other minions, and it will consume them to temporarily empower and heal itself. Using this skill while the Reaper is already summoned causes it to dash to the targeted location and perform a powerful attack.
Eye of WinterFires a single eye projectile which constantly releases shard projectiles in a spiral. The shards will damage enemies they impact, dealing cold damage. The eye cannot damage enemies. When the eye dissipates or collides with terrain, it releases a faster spiral of extra shards.
TornadoCreate a Tornado that hinders and repeatedly damages enemies around it. It will move forward for a duration, during which your projectiles can collide with it to deal damage as though it was an enemy. Then it will chase down enemies for a secondary duration, and reflect a portion of the damage it took from your projectiles to them in addition to its own damage.
Lightning ConduitLightning strikes all Shocked enemies around a targeted location, then removes Shock from those enemies. Shocks cannot expire on enemies in range while casting this spell. Cannot be supported by Spell Cascade or Unleash.
Galvanic FieldApplies a buff boosting chance to shock. When you shock an enemy while you have this buff, creates a spherical field of energy attached to the shocked enemy for a duration, which will damage it and other nearby enemies with beams of lightning. The strength of the field depends on the magnitude of shock affecting the enemy when it is created.
Alchemist's MarkCurses a single enemy, granting flask charges when you hit them and creating Burning Ground under them if your hit Ignites them, and Caustic Ground if it Poisons them. Damage modifiers do not apply to these ground effects. You can only have one Mark at a time.
Cast when Damage Taken Support Unique /1 ⍟

Cast when Damage Taken Support Unique /1 ⍟

Community Wiki

Wiki Edit

Cast when Damage Taken Support

Cast when Damage Taken Support 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. 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 KeystoneBloodMagicBlood 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.

  • 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. 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 follow a specific order, as follows:

1 ⇒ 2
  ⇓
4 ⇐ 3
⇓  
5 ⇒ 6
  • 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.


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