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Cast On Critical Strike Support

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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.

Skill functions and interactions

The chance to trigger is rolled separately for each enemy that received a critical strike, so it is possible to get multiple casts on one skill use if multiple enemies get hit.

In case of multiple spells linked to one attack skill this support will roll its chance to cast for each spell sequentially with 100% chance to cast when the hit crits, rolled once against the critical strike chance, and again against the accuracy rating to make sure it has hit. In the case of a hits can't be evaded modifier, this second roll is counted as 100%.

Cooldown Time: When a supported spell is successfully cast, it and all supported spells of the same name are put on cooldown for 500 milliseconds. This means that a given spell can only trigger once per critical strike, and reduces the effect of linking multiple copies of the same spell to this support (especially when it is at a higher gem level). It is important to note that this cooldown does not apply to the gem as whole; you can trigger multiple spells within the 500 millisecond cooldown time as long as they are different.

Gem level progression

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Quest reward

This skill is not given as quest reward.

Vendor reward

This skill is not a quest reward skill that can be bought at vendors.

Strategy

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.

Projectile

By far the most popular family of Cast on Critical Strike setups, projectile Cast On Critical Strike focuses on the projectile keyword. Popular attacks for this purpose include:

  • Lua error: callParserFunction: function "#ask" was not found.: Naturally staggers hits, automatic pierce, allows the use of melee weapons at range.
  • Lua error: callParserFunction: function "#ask" was not found.: Causes a large number of sequential hits per attack.
  • Lua error: callParserFunction: function "#ask" was not found.: Naturally produces power charges.
  • Lua error: callParserFunction: function "#ask" was not found.: Naturally large number of projectiles.
  • Lua error: callParserFunction: function "#ask" was not found.: Piercing on initial arrow(s) and produces three times as many subprojectiles.
  • Lua error: callParserFunction: function "#ask" was not found.: Five projectiles plus the initial hit.
  • Lua error: callParserFunction: function "#ask" was not found.: Magma balls generally hit on different frames, causing a large number of hits.
  • Lua error: callParserFunction: function "#ask" was not found.: Three projectiles plus the initial hit.

Support skills that affect both the number of hits and crits projectile attacks generate and affect projectile spells include:

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  • Lua error: callParserFunction: function "#ask" was not found. for Lua error: callParserFunction: function "#ask" was not found. and certain spells
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Useful projectile spells and their support limitations include:

  • Lua error: callParserFunction: function "#ask" was not found.: Does not explode on pierce, fork, or chain.
  • Lua error: callParserFunction: function "#ask" was not found.: Not affected by pierce, fork, or chain; hit rate limited per cast, not per projectile.
  • Lua error: callParserFunction: function "#ask" was not found.: Little benefit from Lua error: callParserFunction: function "#ask" was not found. but more from Lua error: callParserFunction: function "#ask" was not found..
  • Lua error: callParserFunction: function "#ask" was not found.: Does not explode on pierce, fork, or chain.
  • Lua error: callParserFunction: function "#ask" was not found.: Benefits from Lua error: callParserFunction: function "#ask" was not found..
  • Lua error: callParserFunction: function "#ask" was not found.: Already pierces in first form.
  • Lua error: callParserFunction: function "#ask" was not found.
  • Lua error: callParserFunction: function "#ask" was not found.: Less benefit from Lua error: callParserFunction: function "#ask" was not found. but more from Lua error: callParserFunction: function "#ask" was not found..

A second spell may satisfactorily be used in place of a support.

Area of Effect

Some attacks have advantageous built-in area of effect:

  • Lua error: callParserFunction: function "#ask" was not found.: The area of effect is progressive, not instant, allowing multiple casts per attack. However, it can only get one cast against a single target.

This works well with spells which have Area of Effect component, such as:

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  • Lua error: callParserFunction: function "#ask" was not found.

Support gems which can benefit this setup are:

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Minion

Another possibility is to use attacks to trigger minions, which benefit from attack supports. In addition to the projectile skills listed before, we have some other good choices:

  • Lua error: callParserFunction: function "#ask" was not found.: Causes two hits per attack, only uses main hand when dual-wielding.
  • Lua error: callParserFunction: function "#ask" was not found.: Causes staggered hits rapidly.

Minions generally have poor critical strike capabilities, so critical strike supports are not as effective as they are with projectile spells. Good attack supports include:

  • Lua error: callParserFunction: function "#ask" was not found.
  • Lua error: callParserFunction: function "#ask" was not found.: While it does not increase procs much due to the splash happening on a single frame, it greatly improves minion effectiveness.
  • Lua error: callParserFunction: function "#ask" was not found.: For Melee attacks.
  • Lua error: callParserFunction: function "#ask" was not found.: Improves minion accuracy greatly, removes the need for accuracy on gear.
  • Since patch 2.0.0, increasing gem quality on Lua error: callParserFunction: function "#ask" was not found. no longer grants 1% increased chance of critical strike per 1% gem quality, and instead gives a simple 1% increased accuracy per 1% gem quality. 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.

Most minions are severely capped in number and thus do not benefit much from the high proc rate of Cast On Critical Strike. However, there is one that works well:

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Passives and gear

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.

Some base item types tend to have better critical hits per second than others:

  1. Wands
  2. Claws, Daggers
  3. Sceptres, Thrusting Swords
  4. Bows, Staves, 1H Swords

Possibly good uniques to use include:

Item Perfect crits/s
Lua error: callParserFunction: function "#ask" was not found. 9.08%
Lua error: callParserFunction: function "#ask" was not found. 11.17%
Lua error: callParserFunction: function "#ask" was not found. 15.50%
Lua error: callParserFunction: function "#ask" was not found. 17.25%
Lua error: callParserFunction: function "#ask" was not found. 13.16%
Lua error: callParserFunction: function "#ask" was not found. 14.28%
Lua error: callParserFunction: function "#ask" was not found. 10.47%
Lua error: callParserFunction: function "#ask" was not found. 10.47%
Lua error: callParserFunction: function "#ask" was not found. 12.19%
Lua error: callParserFunction: function "#ask" was not found. 10.75%
Lua error: callParserFunction: function "#ask" was not found. 12.09%
Lua error: callParserFunction: function "#ask" was not found. 10.00%
Lua error: callParserFunction: function "#ask" was not found. 16.67%
Lua error: callParserFunction: function "#ask" was not found. 63.00%

Version history

Version Changes
2.4.0
  • For Cast on Critical Strike, Lua error: callParserFunction: function "#ask" was not found., Lua error: callParserFunction: function "#ask" was not found. and Lua error: callParserFunction: function "#ask" was not found., 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).
1.3.0
  • Cast on Critical Strike's cooldown has been increased from 0.01 seconds to 0.05 seconds.
1.2.0
  • The chance to cast has been reduced by a flat 20% at all levels.
1.0.5
  • Cast on Critical Strike now has a 10 millisecond cooldown. The chance to cast supported skills has been increased by a flat 20%.
1.0.0e
  • The Cast on Crit support gem has been renamed to Cast on Critical Strike
1.0.0
  • Cast on Crit has been added to the game.