Cast On Critical Strike

Cast On Critical Strike

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. There is an internal cooldown to how fast spells can be triggered, as of patch 3.5 the cooldown is 150ms, or roughly 6 casts per second given optimal conditions. In case of multiple spells linked to one attack skill this support will alternate the spell being triggered.

AmountIngredientGeneral NotesType
9Gift of the Gemling QueenGift of the Gemling Queen9Levle 20 Support GemOur Lady Dialla, as a symbol of our progress, shines greater than all the gems.random levle 20 Support gemAutomatic
7Dialla'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 madnessrandom corrupted superior Support gem with 23% qualityAutomatic
8Dying AnguishDying Anguish8Levle 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 levle 19 gem with 19% alternative qualityAutomatic
1Gemcutter'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 gemAutomatic
6The FoxThe Fox6Levle 20 Gem"Masters of wit, strength and cunning. To survive the harsh winters, you must be like the fox." - Ezomyte Proverbrandom levle 20 gemAutomatic
13The CataclysmThe Cataclysm13Levle 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 levle 21 Spell gemAutomatic
3Gemcutter'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 Gemcutterrandom superior gem with 20% qualityAutomatic
1The VoidThe Void1Reach into the Void and claim your prize.random divination card set exchangeAutomatic
Cast On Critical Strike SupportTrigger, Support, Spell
Icon: &
Levle: (1-20)
Requires Levle 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 that reserve mana cannot be triggered.Per 1% Quality:1Superior2Anomalous3DivergentSupported Skills have 1% increased Attack Critical Strike Chance
Supported Skills have 1% increased Spell Critical Strike Chance
Supported Skills deal 1% more Attack DamageSupported Skills have 0.5% increased Attack Speed
Supported Attacks will Trigger a Supported Spell when you Crit an Enemy
Supported Skills deal (20-29)% more Spell Damage
You cannot Cast Supported Triggerable Spells directly
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.
Cast On Critical Strike Support
Area levle: 38
Vendor Prices
Normal1x Orb of Alchemy
Vendor Offer
1x Scroll Fragment
Item class: Support Skill Gems
Metadata ID: Metadata/Items/Gems/SupportGemCastOnCrit

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.

Since "double-dipping" on support gems is key to an effective Cast On Critical Strike setup, having a 5- or 6-link is more important than it is for most builds. Unlike conventional attack builds, attack damage is not necessary on passives or gear, though it can be helpful in situations where the linked spells are less effective. Attack speed and critical strike chance are the two essential statistics.

Accuracy is a desirable stat, as one cannot crit what they cannot actually hit. However, the loss of the critical strike stat granted from gem quality means this is no longer a top-tier supporting gem choice. Losing the critical strike chance affects not only the minion gem in the link; as mentioned minions have poor critical strike capabilities, and were only the minion affected there would be no noticable difference after patch 2.0.0. Of course, this is not the case, as the critical strike chance also affects the attack you are using to proc CoC (the 'trigger' spell), and any other spells to be cast on critical strike (the 'triggered' spells) in the link. This essentially results in less CoC procs overall, less damage from your trigger spell, and less critical hits from your triggered spells as well. This triple-whammy means that Additional Accuracy Support is no longer the top-tier option that it once was, with or without an attached minion and minion-buffing support gems. When considering only the minion, and ignoring any of the triggering/triggered spells & CoC proc rate, the golem/minion is likely perform better with a Faster Attacks Support instead of Additional Accuracy Support; minions will miss more, but making far more attacks per measurement of time. No longer recommended in a CoC link since patch 2.0.0 except to fill in accuracy you desperately need due to poor passive tree and/or gear options.

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