Bear Grudge

sadistically torment an effigy of a target of your hate. The creature must pass a WISDOM saving throw or your hate is channeled into a curse upon them, taking 4d12 damage on a success, or half damage on a failure.

If the target dies from the triggering damage, you gain the same amount of damage done as temporary HP.

At Higher Levels: The damage increases by 1d12 for each spell slot level above 3.