Crow Monstrosity

Dark Devotion. The creature has advantage on saving throws against being charmed or frightened.

Flesh Sacrifice (Recharge 5-6). The creature deals (1d6) slashing damage to itself. The creature may take one additional action on top of their regular action and a possible bonus action. 

Leech. Stepping on a bloody 5 ft. surface, heals you for (1d4) hit points. 

Multiattack. The creature can make two melee attacks with its Claw.

Claw. Melee Weapon Attack: +5 to hit, reach 5 ft., one creature. Hit: (1d8 + 3) slashing damage plus (2d8) poison damage. The target must make a dc on a failed save, or half as much damage on a successful one If the poison damage reduces the target to 0 hit points, the target is stable but poisoned for 1 hour, even after regaining hit points, and is paralyzed while poisoned in this way.