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
You cannot Cast Supported Triggerable Spells directly
Trigger Supported Spells when you take (528-3272) total Damage from Hits

Additional Effects From 1-20% Quality:
Supported Skills deal 0.5% increased DamageSupported Skills have 1% increased Skill Effect DurationSupported Skills require 1% 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

Main page: Trigger

Trigger gem: Like all trigger gems, Cast when Damage Taken only triggers and 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 trigger cooldown: Cast when Damage Taken adds an internal damage counter that tracks the total accumulated damage taken from hits. Damage over time and life/energy shield costs/sacrifices do not contribute to this counter. (e.g. you cannot use to trigger Cast when Damage Taken). All damage counters will be reset to 0 upon entering a new area. When the linked spell is triggered, it adds a unique cooldown to the spell for 250 ms and will not track damage during that time. The Cast when Damage Taken gem itself does not have its own counter or cooldown.

Multiple copies of the same gem share global cooldowns, meaning that if two copies of the same spell have their trigger conditions met within 250 ms of each other, the first will trigger and the second will fail to trigger as it is on global cooldown.

Skill cooldowns: Skill-specific cooldowns (e.g. Hexblast) are independent of the cooldown granted by Cast when Damage Taken and do not interact. Both the trigger and the skill must be off cooldown to proc the skill.

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 by this restriction.

Trigger order: If multiple triggers proc simultaneously, skills triggered follow a set priority. First, skill gems in socket 1 of any piece of gear will apply before any skill gems in socket 2. Items with less than 6 sockets still follow this pattern from socket 1.

(1)⇒(2)
     ⇓
(4)⇐(3)
 ⇓
(5)⇒(6)

Then, if multiple triggered skills are in socket 1, the following priority is used:

Main hand ⇒ Amulet ⇒ Helm ⇒ Off hand ⇒ Body armour ⇒ Gloves ⇒ Boots

Therefore, the trigger order will follow:

Main hand (1) ⇒ Amulet (1) ⇒ ... ⇒ Boots (1) ⇒ Main hand (2) ⇒ Amulet (2) ⇒ ...

For skills that are dependent on another skill (e.g. and ), it is advised to place the dependent skill in a later socket to ensure smooth functioning.

Damage effectiveness: Each gem level lessens the damage penalty but increases the damage threshold to trigger. The actual damage effectiveness of the support gem decreases as CwDT levels up. However, as spells scale significantly with gem levels, a higher-level CwDT setup will do more DPS on average than a lower-level CwDT.

Targeting: Triggered spells will cast at the location of or in the direction of the source of damage that hit the damage threshold. 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 be cast at the player's location; if the triggered skill is a projectile, it will be fired in a random direction).

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

Gem quality

Type	Additional Effects per 1-20% Quality	Weight
Superior	Supported Skills require (0.5-10)% reduced amount of Damage taken to Trigger	1

Related unique items

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

Item	Base Item		Stats

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:

Offensive:

• for applying Exposure
• for applying Cold Exposure and reducing enemies' Life/Energy Shield regen
• for Frenzy Charge generation
• Offensive curses such as , , , , , , etc.
• Offensive golems such as , ,

Defensive:

• Guard skills such as , , , Arcane CloakArcane CloakSpell, Duration, Guard, Lightning, Arcane
  Level: (1-20)
  Cooldown Time: 4.00 sec
  Can Store 1 Use(s)
  Cast Time: InstantRequires Level 16Spends 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.Base duration is 3.00 seconds
  Spends (45-64)% of current Mana
  75% of Damage from Hits is taken from Buff before your Life or Energy Shield
  Buff can take Damage equal to Mana Spent by this Skill's effect
  Buff grants Added Lightning Damage equal to (10-14)% of Mana Spent by this Skill's effect
  This Skill's Cooldown does not recover during its effect
  
  Additional Effects From 1-20% Quality:
  (1-20)% increased Buff EffectPlace into an item socket of the right colour to gain this skill. Right click to remove from a socket.,
  • Only one guard skill should be used in all CWDT setups, as they share their cooldown
  • can be used to increase the duration
• for Elusive and Phasing.
• for increased movement speed, reduced visibility and Phasing
  • Useful for builds that often run past packs such as minion or DOT builds
  • Make sure Phase Run is the last skill to be triggered in all CWDT setups
• to block enemies.
• to Hinder enemies.
• , or to chill enemies.
  • Can be linked with Bonechill SupportBonechill SupportCold, Support
    Icon: B
    Level: (1-20)
    Cost & Reservation Multiplier: 130%Requires Level 38Supports any skill that can chill enemies or create chilling areas.(25-44)% increased Effect of Chill inflicted with Supported Skills
    Enemies Chilled by Supported Skills increase Cold Damage taken by Chill Effect
    Enemies in Chilling Areas from Supported Skills increase Cold Damage taken by Chill Effect
    Supported Skills deal (5-14)% more Cold Damage
    
    Additional Effects From 1-20% Quality:
    Supported Skills deal (0.5-10)% increased Cold 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. for increased chill effect
• to create Consecrated Ground
• , , or Bone OfferingBone OfferingMinion, Spell, Duration
  Level: (1-20)
  Cost: (16-33) Mana
  Cast Time: 1.00 secRequires Level 12Consumes 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.Base duration is 5.00 seconds
  Additional 1.00 seconds Base Duration per extra corpse Consumed
  Grants Minions +(25-35)% Chance to Block Attack Damage
  Grants Minions +(25-34)% Chance to Block Spell Damage
  Grants Minions 4% of Life Regenerated per Second if they have Blocked recently
  
  Additional Effects From 1-20% Quality:
  (0.5-10)% increased Effect of OfferingPlace into an item socket of the right colour to gain this skill. Right click to remove from a socket. for passive corpse disposal and minion buffing
• to escape melee range (could backfire).
• Defensive curses such as ,
• Defensive golems such as , .
  • Can be linked with

Other:

• for builds that die often.
• is often used in AFK boss kill attempts such as Uber Elder or Sirus.

Some supports also potentially combine well, especially with a persistent rapid-firing skill such as Ball LightningBall LightningSpell, Projectile, AoE, Lightning
Level: (1-20)
Cost: (12-23) Mana
Cast Time: 0.70 sec
Critical Strike Chance: 5.00%
Effectiveness of Added Damage: 60%
Projectile Speed: 400
AoE Radius: 22Requires Level 28Fires a slow-moving projectile that damages each enemy in an area around it repeatedly with bolts of lightning.Deals (2-32) to (47-617) Lightning Damage
Base radius is 1.8 metres

Additional Effects From 1-20% Quality:
Base radius is (0.01-0.2) metresPlace into an item socket of the right colour to gain this skill. Right click to remove from a socket.:

• Blind SupportBlind SupportSupport
  Icon: x
  Level: (1-20)
  Cost & Reservation Multiplier: 110%Requires Level 8Supports any skill that hits enemies.Supported Skills have 10% chance to Blind enemies on hit
  Supported Skills have (0-38)% increased Blinding duration
  
  Additional Effects From 1-20% Quality:
  (0.5-10)% increased Blind EffectThis 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.
• Passive IIR culling via , , and a skill that causes many hits.
• (As of Version 1.2.2 CWDT will only trigger Ball Lightning in this example, Ball Lightning will then only trigger Hextouch if the supported curse is above the CWDT level threshold.)

With self-damaging mechanics, it is possible to cause spells created from CWDT to proc CWDT again, creating a loop. Some possibilities are:

• • Pros: stable output; you can tune proc rate by changing mana cost; only one item required
  • Cons: requires fast recovery to mitigate damage taken. Otherwise, you can kill yourself in your hideout just by testing skills. Usually Agnostic Pathfinder with mana flask, Clarity watcher's eye mod, Battle Rouse

• • Pros: stable output
  • Cons: same as Scold's + huge waste of jewel sockets

• Eye of InnocenceEye of Innocence
  Citrine AmuletRequires Level 68+(16-24) to Strength and Dexterity10% chance to Ignite
  (50-70)% increased Damage while Ignited
  Take 100 Fire Damage when you Ignite an Enemy
  2% of Fire Damage Leeched as Life while Ignited"...and so He said: 'Let only the good meet my gaze'
  and no eye met His. So He called down the cleansing flames
  and let black smoke sweep the Sinners away."
  - Book of Innocence
  • Pros: great recovery (at worst you take damage as frequently as you gain HP back); many recovery options: Vitality mod, Discipline mod, Ngamahu's Sign, Razor of the Seventh Sun, Shaper rings
  • Cons: 100% chance to ignite forces passive tree/ascendancy choices; easier to get best proc rates against packs than against single targets

• • Pros: stable recovery, you can adapt to bad map mods by changing a number of socketed Powerlessness jewels
  • Cons: Pathfinder mana or tons of unique items to get HP recovery, better proc rates against packs than single target

• or
  • Pros: one item
  • Cons: requires external life recovery, low trigger rate (enough to proc Vengeance)

Quick reference chart of commonly used spell gems and their maximum allowed level to be supported by each level of CWDT:

Level	Damage Threshold	Damage Modifier	Max level of spell gems	(Endurance charge bonus)	(additional armour)						Blood RageBlood RageSpell, Duration, Physical Level: (1-20) Cost: (12-29) Life Cooldown Time: 1.00 sec Can Store 1 Use(s) Cast Time: InstantRequires Level 16Adds 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.Base duration is (7.00-10.80) seconds Grants (5-15)% increased Attack Speed 1.2% of Attack Physical Damage Leeched as Life You take 4% of your Maximum Life per second as Physical Damage You take 4% of your Maximum Energy Shield per second as Physical Damage 25% chance to gain a Frenzy Charge on Kill Additional Effects From 1-20% Quality: Grants (0.25-5)% increased Attack SpeedPlace into an item socket of the right colour to gain this skill. Right click to remove from a socket.			Golem (any)
1	528	-70%	38	3 (106%)	10 (282)	4	5	10	7	4	7	3	5	3
2	583	-66%	40	4 (109%)	11 (328)	5	6	11	8	5	8	4	6	4
3	661	-62%	42	5 (112%)	11 (328)	6	7	11	8	6	8	5	7	5
4	725	-58%	44	6 (115%)	12 (378)	7	7	12	9	7	9	6	7	6
5	812	-54%	46	7 (118%)	12 (378)	8	8	12	10	8	10	7	8	7
6	897	-50%	48	8 (121%)	13 (433)	9	9	13	10	9	10	8	9	8
7	1003	-46%	50	9 (124%)	13 (433)	10	10	13	11	10	11	9	10	9
8	1107	-42%	52	10 (127%)	14 (495)	11	11	14	12	11	12	10	11	10
9	1221	-38%	54	11 (130%)	14 (495)	12	12	14	12	12	12	11	12	11
10	1354	-34%	56	12 (133%)	15 (545)	13	13	15	13	13	13	12	13	12
11	1485	-30%	58	13 (136%)	16 (599)	14	14	16	14	14	14	13	14	13
12	1635	-26%	60	14 (139%)	16 (599)	15	15	16	15	15	15	14	15	14
13	1804	-22%	62	15 (142%)	17 (657)	16	16	17	16	16	16	15	16	15
14	1980	-18%	64	16 (145%)	18 (719)	17	17	18	17	17	17	16	17	16
15	2184	-14%	65	16 (145%)	18 (719)	17	17	18	17	17	17	16	17	16
16	2394	-10%	66	17 (148%)	18 (719)	18	18	18	18	18	18	17	18	17
17	2621	-6%	67	17 (148%)	19 (786)	18	18	19	18	18	18	17	18	17
18	2874	-2%	68	18 (151%)	19 (786)	19	19	19	19	19	19	18	19	18
19	3142	+2%	69	19 (154%)	19 (786)	19	19	19	19	19	19	19	19	19
20	3272	+6%	70	20 (157%)	20 (858)	20	20	20	20	20	20	20	20	20
21	3580	+10%	72	21 (160%)	21 (909)	21	21	21	21	21	21	21	21	21
22	3950	+14%	74	22 (163%)	22 (962)	22	22	22	22	22	22	22	22	22
23	4350	+18%	76	23 (166%)	23 (1018)	23	23	23	23	23	23	23	23	23

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
3.19.0	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.