Doom

The caster sees into the hearts of nearby creatures and judges them. All Neutral and Evil creatures within 100 feet are marked with heavenly angelfire and must succeed on a WIS saving throw (DC 20). Upon failure, the angelfire mark begins counting down from 30 seconds (five turns.) When the time expires, the angelfire burns its target from the inside out, killing them instantly. Upon success, the mark counts down from 60 seconds (ten turns) instead.

Doom can be dispelled only by killing its source or disengaging from combat and moving more than 100 feet away from its source.