Batsquatch

Dive Attack. If the Batsquatch is flying and dives at least 30 feet toward a target and then hits with a fist attack, the attack deals an extra 10 (3d6) damage to the target.

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

Fearful Appearance. Any creature attacking the Batsquatch, attacks with disadvantage  

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

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

 Bite. Melee Weapon Attack: +4 to hit, reach 5 ft., one creature. Hit: 5 (1d6 + 2) piercing damage.

Excrement Throw. Range Attack: +2 to hit, reach 15 ft., one target. Hit:1 bludgeoning damage.

Fist. Melee Weapon Attack: +9 to hit, reach 10 ft., one target. Hit: 22 (3d10 + 6) bludgeoning damage.

Multiattack. The Batsquatch makes two fist attacks.

Rock. Ranged Weapon Attack: +9 to hit, range 50/100 ft., one target. Hit: 30 (7d6 + 6) bludgeoning damage.

Monkey See. As an action, any dropped one handed weapon that Batsquatch saw someone use can pick it up and now use it as their own weapon.

Wing Attack (Costs 2 Actions). The Batsquatch beats its wings. Each creature within 10 feet of the Batsquatch must succeed on a DC 20 Dexterity saving throw or take 14 (2d6 + 7) bludgeoning damage and be knocked prone. The Batsquatch can then fly up to half its flying speed.

Mythic Resistance (3/Day). If the Batsquatch fails a saving throw, it can choose to succeed instead.

Stunning Screech (1/Day). The Batsquatch emits a horrific screech. Each creature within 20 feet of it that can hear it must succeed on a DC 14 Constitution saving throw or be stunned until the end of the Batsquatch's next turn.