Nimbleness

8% increased Cast Speed
+15% to Critical Strike Multiplier for Spell Damage [1]

Nimbleness is a notable passive skill that grants increased cast speed and additional critical strike multiplier for spells.

Anointment

Blight anointment to unlock the passive:

Oil #1	Oil #2	Oil #3	Outcome
Amber Oil	Crimson Oil	Crimson Oil	Nimbleness	8% increased Cast Speed +15% to Critical Strike Multiplier for Spell Damage

Version	Changes
3.16.0	[Undocumented This change was not documented by any official sources. It was discovered through player testing or datamining.] Now grants 8% increased Cast Speed (up from 6%) and +15% to Critical Strike Multiplier for Spells (up from 12%). No longer grants 4% increased Movement Speed or 15% chance to Avoid interruption from Stuns while Casting.
2.0.0	Also provides 4% increased Movement Speed and 15% chance to Avoid interruption from Stuns while Casting in addition to 6% increased Cast Speed.