Decimate (Dominion of Grixis)

You unleash life-destroying magic upon a creature you can see within range. A target must succeed on a Charisma saving throw or take necrotic damage equal to two rolls of its hit die. Also on a failed save, the target loses two hit dice. If it has no (more) hit dice to lose, it instead suffers one level of exhaustion. A creature can regain hit dice lost by this spell as normal.

If you target an Undead, it instead regains hit points equal to two rolls of its hit die.

If you target a Celestial, it automatically fails the saving throw.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the number of hit dice rolled for damage and the number of hit dice lost is increased by two per slot level above 1st.

Special School of Magic. This spell is belongs to the School of Grixis; only an evil-aligned creature can cast this spell.