Cast On Critical Strike SupportCritical, Support, Spell, Trigger Icon: & Level: (1-20) Cost & Reservation Multiplier: 120%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 You cannot Cast Supported Triggerable Spells directly
Additional Effects From 1-20% Quality: Supported Skills have 1% increased Attack Critical Strike ChanceSupported Skills deal 1% more Attack DamageSupported Skills have 0.5% increased Attack SpeedThis 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.
Acquisition Drop level: 38Vendor Offer 1x Scroll FragmentMetadata Item class: Support Gem Metadata ID: Metadata/Items/Gems/SupportGemCastOnCrit
Cast on Critical Strike (commonly referred to as CoC) is a support gem that causes linked spells to trigger when the player scores a critical strike with the attack skill it is linked to.
If more than one spell is supported by a Cast on Crit Support, each proc will cycle through each valid spell based on trigger order.
When a supported spell is successfully triggered, all spells with the same name supported by that Cast on Crit Support are placed on cooldown. This prevents multiple copies of the same spell from being triggered sequentially.
Due to how server ticks are calculated, there are breakpoints of cooldown recovery rates required to achieve a higher effective trigger rate.[1]. Additional CDR that does not reach the next threshold is wasted.
The attack rates below are maximums; exceeding the attack rates even slightly can significantly reduce proc rate due to skipping procs while the skill is still on cooldown. It is better to be slightly below the attack rate than above it. Note that multiples of the attack rate also work (e.g. 12.12 APS will proc at the same rate as 6.06 APS).
Cooldown Rate
Effective Cooldown
Attack Rate
0%
165 ms
6.06
14%+
132 ms
7.57
52%+
99 ms
10.10
128%+
66 ms
15.15
Gem level progression
Level
Less Spell Damage
Exp.
Total Exp.
1
38
40
27
19%
0
0
2
40
41
29
19%
388734
388734
3
42
43
30
18%
477437
866171
4
44
45
31
18%
583786
1449957
5
46
47
33
17%
710359
2160316
6
48
49
34
17%
1355511
3515827
7
50
51
35
16%
1138877
4654704
8
52
53
37
16%
1368233
6022937
9
54
55
38
15%
1638338
7661275
10
56
57
39
15%
1956648
9617923
11
58
58
41
14%
3655184
13273107
12
60
60
42
14%
3017327
16290434
13
62
62
43
13%
3576232
19866666
14
64
64
44
13%
4231667
24098333
15
65
65
45
12%
2395078
26493411
16
66
66
46
12%
8421063
34914474
17
67
67
46
11%
16159983
51074457
18
68
68
47
11%
41170367
92244824
19
69
69
48
10%
86794448
179039272
20
70
70
48
10%
157405063
336444335
21
72
72
50
9%
N/A
N/A
22
74
N/A
N/A
9%
N/A
N/A
23
76
N/A
N/A
8%
N/A
N/A
24
78
N/A
N/A
8%
N/A
N/A
25
80
N/A
N/A
7%
N/A
N/A
26
82
N/A
N/A
7%
N/A
N/A
27
84
N/A
N/A
6%
N/A
N/A
28
86
N/A
N/A
6%
N/A
N/A
29
88
N/A
N/A
5%
N/A
N/A
30
90
N/A
N/A
5%
N/A
N/A
31
91
N/A
N/A
5%
N/A
N/A
32
92
N/A
N/A
4%
N/A
N/A
33
93
N/A
N/A
4%
N/A
N/A
34
94
N/A
N/A
4%
N/A
N/A
35
95
N/A
N/A
3%
N/A
N/A
36
96
N/A
N/A
3%
N/A
N/A
37
97
N/A
N/A
3%
N/A
N/A
38
98
N/A
N/A
3%
N/A
N/A
39
99
N/A
N/A
3%
N/A
N/A
40
100
N/A
N/A
2%
N/A
N/A
Gem quality
Type
Stats (per 1% quality)
Weight
Superior
Supported Skills have 1% increased Attack Critical Strike Chance Supported Skills have 1% increased Spell Critical Strike Chance
50
Anomalous
Supported Skills deal 1% more Attack Damage
50
Divergent
Supported Skills have 0.5% increased Attack Speed
100
Item acquisition
Cast On Critical Strike Support can drop anywhere.
Recipes
Cast On Critical Strike Support can be created from the following recipes:
Amount
Part
Description
Meta
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 corruptedlevel 21 Spell gem
A
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
A
7
Dialla's SubjugationDialla's Subjugation7Support 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 corruptedsupport gem with 23% quality
A
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
A
3
Gemcutter's PromiseGemcutter's Promise3Gem 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 gem with 20% quality
A
1
Gemcutter's IncubatorGemcutter's IncubatorStack Size: 10Adds an incubated Quality Gem item to an equippable item Item drops after killing {0} monstersRight click this item then left click an item to apply it. The Incubated item drops after killing a specific number of monsters.
Random gem with 1–20% quality
A
1
The VoidThe Void1Reach into the Void and claim your prize.
Random divination card set exchange
A
Vendor reward
This item can be bought at the listed NPC vendors, after completing the following quests:
Specify the reason an update is needed using |reason=.
Linking with other skills
At a bare minimum, a Cast On Critical Strike setup will require three gems: an attack, Cast On Critical Strike itself, and a spell to be triggered. This generally leaves at most three other supports that may be linked. If possible, the supports should both increase the number of times Cast On Critical Strike triggers, and increase the effectiveness of the triggered spells. Note that Cast On Critical Strike cannot trigger more than once per frame, so staggered hits (e.g. multiple projectiles) are preferred to simultaneous hits (e.g. most area of effect damage) which will only proc at most once per attack.
Related modifiers
The following modifiers are related to Cast On Critical Strike Support:
The following unique items are related to Cast On Critical Strike Support:
Item
Base Item
Stats
Forbidden ShakoForbidden Shako Great CrownArmour: (143-161) Energy Shield: (29-33)Requires Level 68, 59 Str, 59 IntSocketed Gems are Supported by Level (1-10) <random Support Gem> Socketed Gems are Supported by Level (25-35) <random Support Gem> +(25-30) to all AttributesThe Azmeri must never touch the Tears of Maji, lest Viridi weep.
Socketed Gems are Supported by Level (1-10) <random Support Gem> Socketed Gems are Supported by Level (25-35) <random Support Gem> +(25-30) to all Attributes
The Hungry LoopThe Hungry Loop Unset RingRequires Level 70Has 1 SocketConsumes Socketed Uncorrupted Support Gems when they reach Maximum Level Can Consume 4 Uncorrupted Support Gems Has not Consumed any Gems <Consumed support gem modifier>Be careful where you put your finger.
Cast on Critical Strike Support now deal 19% less Spell Damage at gem level 1 (previously 20% more), and 10% less at gem level 20 (previously 29% more).
For Cast on Critical Strike, 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., MjölnerMjölner GavelOne Handed Mace Physical Damage: (97.2-118.8) to (181.8-222.2) Critical Strike Chance: 5.00% Attacks per Second: 1.15 Weapon Range: 1.1 metresRequires Level 60, 412 Str, 300 Int15% reduced Enemy Stun ThresholdTrigger a Socketed Lightning Spell on Hit, with a 0.25 second Cooldown Socketed Lightning Spells have no Cost if Triggered +300 Intelligence Requirement +200 Strength Requirement (80-120)% increased Physical Damage Skills Chain +1 times (80-100)% increased Lightning DamageLook the storm in the eye and you will have its respect. and Cospri's MaliceCospri's Malice Jewelled FoilOne Handed Sword Elemental Damage: (80-100) to (160-200) Critical Strike Chance: 5.50% Attacks per Second: (1.73-1.82) Weapon Range: 1.4 metresRequires Level 68, 212 Dex, 257 Int+25% to Global Critical Strike MultiplierTrigger a Socketed Cold Spell on Melee Critical Strike, with a 0.25 second Cooldown No Physical Damage Adds (80-100) to (160-200) Cold Damage Adds (40-60) to (90-110) Cold Damage to Spells (8-14)% increased Attack Speed +257 Intelligence Requirement 60% increased Critical Strike Chance against Chilled EnemiesBreathe deep, my child. Let the frigid air engulf your soul. Embrace the eternal cold, And it will embrace you back., only one skill can be triggered per trigger event.
The spell that is triggered is determined based on the order in which it is socketed, and will cast supported spells in sequence, even across multiple attacks. These items and skills also have cooldowns which limit how often a skill is cast.
These cooldowns apply per-triggered-skill, rather than applying to the trigger gem itself.
Cast on Critical Strike now has a 500ms cooldown, and will now only trigger one spell per frame when you critically strike. It now has 100% chance to trigger casts when you critically strike. It now has 20% more spell damage at level 1, tapered up to 39% at level 20 (1% per level).