Cast On Critical Strike Support

Causes a linked spell to activate when the player rolls a critical strike with the attack skill it is linked to.

The chance to cast is rolled separately for each enemy you scored a critical hit on, so it is possible to get multiple casts on one skill use if you hit multiple enemies and are lucky enough.

In case of multiple spells linked to one attack skill this support will roll its chance to cast for each spell separately, so it's possible to cast either one of them, both, or none.

Skill Functions and Interactions

Cooldown Time: When a supported spell is successfully cast, it and all supported spells of the same name are put on cooldown for 10 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 10 millisecond cooldown time as long as they are different.

Gem level progression

Template:GemLevelTable |- ! 1 | 31 || 33 || 23 || 30% || 179,320 |- ! 2 | 33 || 35 || 24 || 32% || 225,766 |- ! 3 | 35 || 37 || 25 || 34% || 282,073 |- ! 4 | 37 || 39 || 27 || 36% || 349,759 |- ! 5 | 39 || 40 || 28 || 38% || 431,204 |- ! 6 | 41 || 42 || 29 || 40% || 528,465 |- ! 7 | 43 || 44 || 31 || 42% || 644,165 |- ! 8 | 45 || 46 || 32 || 44% || 782,325 |- ! 9 | 47 || 48 || 33 || 46% || 945,554 |- ! 10 | 49 || 50 || 35 || 48% || 1,138,377 |- ! 11 | 51 || 52 || 36 || 50% || 1,368,233 |- ! 12 | 53 || 54 || 37 || 52% || 1,638,338 |- ! 13 | 55 || 56 || 39 || 54% || 1,956,648 |- ! 14 | 57 || 57 || 40 || 56% || 2,329,968 |- ! 15 | 59 || 59 || 41 || 58% || 9,826,462 |- ! 16 | 61 || 61 || 43 || 60% || 21,126,787 |- ! 17 | 63 || 63 || 44 || 62% || 50,254,966 |- ! 18 | 65 || 65 || 45 || 64% || 98,391,985 |- ! 19 | 67 || 67 || 46 || 66% || 146,266,188 |- ! 20 | 69 || 69 || 48 || 68% || - |}

Quest reward

This skill can be gained as a reward for finishing quest:

• A Fixture of Fate in Act 3 (Merciless), by all classes.

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 explosion.

Projectiles

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

• : Naturally staggers hits, automatic pierce, allows the use of melee weapons at range.
• : Causes a large number of sequential hits per attack.
• Split Arrow: Naturally large number of projectiles.
• : Piercing on initial arrow(s) and produces many subprojectiles.
• Molten Strike: Magma balls generally hit on different frames, causing a large number of hits.
• Lightning Strike: Three projectiles plus the initial hit.

Version history

Version	Changes
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.