Chain Crow

Devil's Sight. Magical darkness doesn't impede the Chain Crow darkvision.

Magic Resistance. The chain crow has advantage on saving throws against spells and other magical effects.

False Appearance. While the chain crow remains motionless, it is indistinguishable from an ordinary, inanimate scarecrow.

Butcher's Lure. Chain crow's lack the ability to speak but can mimic sounds they have heard, using this ability to murder their victims. 

Multiattack. The chain crow makes four attacks with it's chain, if it has a target grappled it can replace one of these attacks with a claw. 

Chain. Melee Weapon Attack: +9 to hit, reach 10 ft., one target. Hit: 12 (2d6 + 5) slashing damage. The target is grappled (escape DC 16) if the devil isn't already grappling a creature. Until this grapple ends, the target is restrained and takes 7 (2d6) piercing damage at the start of each of its turns.

Claw. Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 7 (2d4 + 5) slashing damage. If the target is a creature, it must succeed on a DC 18 Wisdom saving throw or be frightened until the end of the scarecrow's next turn.

Animate Chains (Recharges after a Short or Long Rest). Up to four chains the chain crow can see within 60 feet of it magically sprout razor-­edged barbs and animate under the devil's control, provided that the chains aren't being worn or carried.

Each animated chain is an object with AC 20, 20 hit points, resistance to piercing damage, and immunity to psychic and thunder damage. When the chain crow uses multiattack on its turn, it can use each animated chain to make one additional chain attack. An animated chain can grapple one creature of its own but can't make attacks while grappling. An animated chain reverts to its inanimate state if reduced to 0 hit points or if the chain crow is incapacitated or dies.

Terrifying Visage. The chain crow targets one creature it can see within 30 feet of it. If the target can see the scarecrow, the target must succeed on a DC 18 Wisdom saving throw or be magically frightened until the end of the chain crow’s next turn. The frightened target is paralyzed. 

Unnerving Mask. When a creature the chaincrow can see starts its turn within 30 feet of the chain crow, the chain crow can create the illusion that it looks like one of the creature's departed loved ones or bitter enemies. If the creature can see the chain crow, it must succeed on a DC 18 Wisdom saving throw or be frightened until the end of its turn.