Bainligor

Echolocation. The bainligor can't use their blindsight while deafened.

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

Sunlight Sensitivity. While in sunlight, the bainligor has disadvantage on attack rolls, as well as on Wisdom (Perception) checks that rely on sight.

Bite. Melee Weapon Attack: +2 to hit, reach 5 ft., one creature. Hit: 3 (1d6) piercing damage.

Piercing Shriek (1/Day). The bainligor emits an earsplitting screech. Each creature within 20 feet that can hear it and isn't a bainligor must succeed on a DC 10 Constitution saving throw, or be stunned until the end of the bainligor's next turn and become deafened. A target can repeat the saving throw at the end of each of its turns to end the condition.