curse of the broken

This spell is only triggered when the caster has reached 1 HP or below, triggered in only most dire circumstances. 

A blast of shadows ripple out in a 60-foot-radius sphere from the caster. Each creature in that area must make a Constitution saving throw. A target takes 8d6 necrotic damage on a failed save, or half as much damage on a successful one. 

At Higher Levels. When you cast this spell using a spell slot of 7th level or higher, the damage increases by 2d6 for each slot level above 5th.