You channel the base energy of the nine hells to assist you in battle. For 1 minute you grow a stinger on your back that can be used as a bonus action.

Imp Sting. Melee Weapon Attack: +5 to hit, reach 5ft., one target. Hit: 5 (1d4 + 3) piercing damage, and the target must succeed on a DC 11 Con saving throw, taking 10 (3d6) poison damage on a failed save, or half as much on a successful one.