Arrest Heart

Choose a living creature that you can see within range. The target must succeed on a Wisdom saving throw or take 3d6 necrotic damage and be stunned until the end of its next turn. The spell automatically fails if the target does not have a heart or heart-like organ.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d6 for each slot level above 3rd.