Dead Ringer

You stare down one creature you can see within range, creating the sound of an ominous clang above it. The target must succeed on a Wisdom saving throw or take 1d8 necrotic damage. If the target is not at full health, it takes 1d12 necrotic damage instead.
The spell’s damage increases by one die when you reach 5th level (2d8 or 2d12), 11th level (3d8 or 3d12), and 17th level (4d8 or 4d12).