Deep Magic Volume 1
Avoid Grievous Injury
1-level Divination
Casting Time: 1 reaction, which you take when you are struck by a critical hit
Range/Area: Self
Components: Verbal, Somatic
Duration: Instant
Damage/Effect: Protection
You cast this spell when a foe strikes you with a critical hit but before damage dice are rolled. The critical hit against you becomes a normal hit.
Available for: Bard, Cleric, Druid, Sorcerer, Warlock, Wizard