Compelling Blade

As part of the action used to cast this spell, you must make a melee attack with a weapon against one creature within the spell's range, otherwise the spell fails. On a hit, the target suffers the attack's normal effects, and they are compelled not to harm you. Until the spell ends, if they attack you, they take 1d8 psychic damage and the spell ends.
The spell's damage increases when you reach higher levels. At 5th level, the melee attack deals an additional 1d8 psychic damage, and the damage the target takes for attacking you increases to 2d8. Both damage rolls increase by 1d8 at 11th level and 17th level.