Multiattack

The devil makes two Beard Spines attacks and one Glaive attack.

Beard Spines

_Melee Weapon Attack:_ +5 to hit, reach 5 ft., one creature. _Hit:_ 8 (2d4+3) piercing damage, and the target must succeed on a DC 13 CON save or be poisoned for 1 minute. While poisoned in this way, the target can't regain HP. The target can repeat the save at the end of each of its turns, ending the effect on itself on a success.

Glaive

_Melee Weapon Attack:_ +5 to hit, reach 10 ft., one target. _Hit:_ 8 (1d10+3) slashing damage. If the target is a creature other than a Construct or Undead, it must succeed on a DC 13 CON save or lose 3 (1d6) HP at the start of each of its turns due to an infernal wound. Each time the devil hits the wounded target with this attack, the damage dealt by the wound increases by 3 (1d6). Any creature can take an action to stanch the wound with a successful DC 10 WIS (Medicine) check. The wound also closes if the target receives magical healing, provided the target is capable of regaining HP.