Devil’s Bargain

You tempt a creature with a whisper of power and corruption. Choose a creature within range that can hear you. It must make a Charisma saving throw. On a failure, the creature is Charmed for the duration, and it gains advantage on attack rolls, but every attack it hits deals 1d10 psychic damage to itself.

• While charmed this way, the creature cannot willingly move away from you.
• It may repeat the save at the end of each of its turns.

At Higher Levels. When cast using a 4th-level slot or higher, the self-damage increases by 1d10 per slot level above 3rd.