Dirge Bat (Ikoria Bestiary)

Echolocation. The bat can't use its blindsight while deafened.

Keen Hearing. The bat has advantage on Wisdom (Perception) checks that rely on hearing.

Multiattack. The bat makes three attacks: one with its bite and two with its claws.

Bite. Melee Weapon Attack: +5 to hit, reach 5 ft., one creature. Hit: 7 (1d8 + 3) piercing damage.

Claw. Melee Weapon Attack: + 5 to hit, reach 5 ft., one creature. Hit:  6 (1d6 + 3) slashing damage.

Flash (1/day). At the end of a players turn, the dirge bat can change its spot in the initiative order to initiative count 21.

Mutate. If the bat mutates, target a hostile creature within 60 ft. must make a DC 12 Constitution saving throw, taking 22 (4d10) necrotic damage on a failed save, or half as much damage on a successful one.