Camazotz (Giant Bat)

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

Echolocation. Camazotz can't use its blindsight while deafened.

Flyby. The bat doesn't provoke an opportunity attack when it flies out of an enemy's reach.

Shadow Camouflage. Camazotz has advantage on Dexterity (Stealth) checks made to hide in dim light or darkness.

Multiattack. Camazotz makes two attacks: one with its bite and one with its claws.

Bite. Melee Weapon Attack: +13 to hit, reach 5 ft., one creature. Hit: 15 (4d8 + 9) piercing damage. Camazotz regains half of the damage as hit points.

Claw. Melee Weapon Attack: +13 to hit, reach 5 ft., one creature. Hit: 13 (4d8 + 9) slashing damage. The target is grappled (escape DC 19) Until this grapple ends, the target is restrained, and the Camazotz can't use its claws on another target

Scream Burst (Recharge 5-6). Camazotz exhales a screeching cry in a 30-foot cone. Each creature in that area must make a DC 16 Constitution saving throw, taking 20 (6d6) thunder damage and pushed 10 feet away from the bat on a failed save. On a successful save, a creature takes half as much damage and isn't pushed.

Stunning Screech (1/Day). Camazotz emits a horrific screech. Each creature within 20 feet of it that can hear it and that isn't a bat must succeed on a DC 19 Constitution saving throw or be stunned until the end of the bat's next turn.