Cast when Damage Taken Support

Cast when Damage Taken SupportSupport, Spell, Trigger
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.This Gem can only Support Skill Gems requiring Level (38-70) or lower
Supported Skills deal (65-27)% less Damage
Trigger Supported Spells when you take (528-3272) total Damage from Hits

Additional Effects From 1-20% Quality:
Supported Skills require (0.5-10)% reduced amount of Damage taken to TriggerThis 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 Skill Gem you wish to augment. Right click to remove from a socket.

Acquisition
Drop level: 38Vendor Offer
1x Scroll FragmentMetadata
Item class: Support Gem
Metadata ID: Metadata/Items/Gems/SupportGemCastOnDamageTaken

Cast when Damage Taken is a support gem. It causes a linked spell to trigger when the player takes a certain amount of damage from hits.

Skill functions and interactions

Trigger gem: Cast when Damage Taken supports spells. Multiple different spells can be supported, and each will have their own damage taken counter and cooldown. Multiple copies of Cast when Damage Taken will also function independently, as long as they don't support copies of the same active skill, which would cause a shared cooldown.

Damage counter and trigger cooldown: The Cast when Damage Taken gem itself does not have a counter or cooldown, only spells it supports do. Each supported skill has an internal damage counter that tracks the total accumulated damage taken from hits. Damage over time and non-damage loss do not contribute to this counter, i.e. you cannot use to trigger Cast when Damage Taken. All damage counters will be reset to 0 upon entering a new area. A skill does not track damage taken while it is on cooldown. If the damage threshold is met but the skill cannot trigger (e.g. due to insufficient mana), the damage counter resets.

Skill cooldowns: Because skills can only have one cooldown, Cast when Damage Taken does not add its 0.25s cooldown to skills that already have a cooldown that's equal or higher.

Maximum level of supported skills: Cast when Damage Taken cannot support skills with a higher level requirement than that of Cast when Damage Taken itself. This restriction only applies to skill gems; support gems are not affected.

Trigger order: If multiple triggers proc simultaneously, skills triggered follow a set order.

Targeting: Triggered spells will target the location of the entity that dealt the hit that caused the trigger. Reflected damage is considered to come from the enemy which the damage was reflected from. If triggered by self-damage, it will target a random enemy, or if there are no enemies, it will target the player's location or a random direction, depending on the triggered skill.

Gem level progression

Level				Damage Threshold	less/more Damage	Maximum Level of Supported Skill Gems	Exp.	Total Exp.
1	38	40	27	528	65% less	38	0	0
2	40	41	29	583	63% less	40	388734	388734
3	42	43	30	661	61% less	42	477437	866171
4	44	45	31	725	59% less	44	583786	1449957
5	46	47	33	812	57% less	46	710359	2160316
6	48	49	34	897	55% less	48	1355511	3515827
7	50	51	35	1003	53% less	50	1138877	4654704
8	52	53	37	1107	51% less	52	1368233	6022937
9	54	55	38	1221	49% less	54	1638338	7661275
10	56	57	39	1354	47% less	56	1956648	9617923
11	58	58	41	1485	45% less	58	3655184	13273107
12	60	60	42	1635	43% less	60	3017327	16290434
13	62	62	43	1804	41% less	62	3576232	19866666
14	64	64	44	1980	39% less	64	4231667	24098333
15	65	65	45	2184	37% less	65	2395078	26493411
16	66	66	46	2394	35% less	66	8421063	34914474
17	67	67	46	2621	33% less	67	16159983	51074457
18	68	68	47	2874	31% less	68	41170367	92244824
19	69	69	48	3142	29% less	69	86794448	179039272
20	70	70	48	3272	27% less	70	157405063	336444335
21	72	72	50	3580	25% less	72	N/A	N/A
22	74	N/A	N/A	3950	23% less	74	N/A	N/A
23	76	N/A	N/A	4350	21% less	76	N/A	N/A
24	78	N/A	N/A	4780	19% less	78	N/A	N/A
25	80	N/A	N/A	5240	17% less	80	N/A	N/A
26	82	N/A	N/A	5730	15% less	82	N/A	N/A
27	84	N/A	N/A	6250	13% less	84	N/A	N/A
28	86	N/A	N/A	6800	11% less	86	N/A	N/A
29	88	N/A	N/A	7380	9% less	88	N/A	N/A
30	90	N/A	N/A	7990	7% less	90	N/A	N/A
31	91	N/A	N/A	8310	6% less	91	N/A	N/A
32	92	N/A	N/A	8630	5% less	92	N/A	N/A
33	93	N/A	N/A	8965	4% less	93	N/A	N/A
34	94	N/A	N/A	9300	3% less	94	N/A	N/A
35	95	N/A	N/A	9650	2% less	95	N/A	N/A
36	96	N/A	N/A	10000	1% less	96	N/A	N/A
37	97	N/A	N/A	10365	N/A	97	N/A	N/A
38	98	N/A	N/A	10730	1% more	98	N/A	N/A
39	99	N/A	N/A	11110	2% more	99	N/A	N/A
40	100	N/A	N/A	11490	3% more	100	N/A	N/A

Related unique items

The following unique items are related to Cast when Damage Taken Support:

Item	Base Item		Stats

Alternate skill effects

Cast when Damage Taken Support has the following alternate skill effects:

Item	Effect(s)

Cats when Damage Taken

Cats spawned by Cats when Damage Taken

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.

Version history

Version	Changes
3.23.0	Quality now causes Supported Skills to require 0-10% reduced amount of Damage taken to Trigger, instead of causing them to deal 0-10% increased Damage.
3.19.0	Cast when Damage Taken Support now causes Supported Skills to deal 65% less Damage at gem level 1 (previously 70%), up to 27% less Damage at gem level 20 (previously 6% more Damage).
3.15.0	Trigger skill gems now cost mana. Now has a 250% Cost and Reservation Multiplier.
Unknown	The Divergent alternate gem quality has changed to Supported Skills require 1% reduced amount of Damage taken to Trigger [Undocumented This change was not documented by any official sources. It was discovered through player testing or datamining.]
3.12.0	Now has alternative gem quality: Anomalous: Supported Skills have 1% increased Skill Effect Duration (per 1% quality) Divergent: 1% more Damage required to Trigger (per 1% quality)
2.0.0	Enduring Cry is now a Warcry instead of a spell, therefore it can't be cast 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

• Guide:Cast when Damage Taken
• Cast on Death SupportCast on Death SupportSupport, Spell, Trigger
  Icon: !
  Level: (1-20)
  Cost & Reservation Multiplier: 0%Requires Level 38Each supported spell skill will be triggered when you die. Cannot support skills used by totems, traps, or mines. Vaal skills, channelling skills, and skills with a reservation cannot be triggered.(0-152)% more Damage while Dead
  100% chance to Trigger Supported Non-Minion Spells on Death
  Supported Skills Cost nothing
  
  Additional Effects From 1-20% Quality:
  Supported Skills have (3-60)% increased Area of Effect while DeadThis 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 Skill Gem you wish to augment. Right click to remove from a socket.
• Cast On Critical Strike SupportCast On Critical Strike SupportCritical, Support, Spell, Trigger
  Icon: &
  Level: (1-20)
  Cost & Reservation Multiplier: 120%
  Cooldown Time: 0.15 sec
  Can Store 1 Use(s)Requires Level 38Must support both an attack skill and a spell skill to work. The attack skill will trigger a spell when it critically strikes an enemy. Cannot support totems, traps, or mines. Vaal skills, channelling skills, and skills with a reservation cannot be triggered.Supported Attacks will Trigger a Supported Spell when you Crit an Enemy
  Supported Skills deal (19-10)% less Spell Damage
  
  Additional Effects From 1-20% Quality:
  Supported Skills have (1-20)% increased Attack Critical Strike Chance
  Supported Skills have (1-20)% increased Spell Critical Strike ChanceThis 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 Skill Gem you wish to augment. Right click to remove from a socket.
• Cast on Melee Kill SupportCast on Melee Kill SupportSupport, Melee, Attack, Spell, Trigger
  Icon: &
  Level: (1-20)
  Cost & Reservation Multiplier: 120%
  Cooldown Time: 0.15 sec
  Can Store 1 Use(s)Requires Level 38Must support both a melee attack skill and a spell skill to work. The attack skill will trigger a spell when it kills an enemy. Cannot support totems, traps, or mines. Vaal skills, channelling skills, and skills with a reservation cannot be triggered.Supported Melee Attacks will Trigger a Supported Spell on Kill
  Supported Spells have (20-39)% more Spell Damage
  
  Additional Effects From 1-20% Quality:
  Supported Skills deal (0.5-10)% increased Attack Damage
  Supported Skills deal (0.5-10)% increased Spell DamageThis 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 Skill Gem you wish to augment. Right click to remove from a socket.