Magic Resistance. The vine wraith has advantage on saving throws against spells and other magical effects.

Multiattack. The wraith makes two attacks with its vines.

Slam. Melee Weapon Attack: +8 to hit, reach 10 ft., one target. Hit: 11 (2d6 + 4) bludgeoning damage. The target is grappled (escape DC 14) if the Vine Wraith sn't already grappling a creature. Until this grapple ends, the target is restrained and takes 7 (2d6) bludgeoning damage at the start of each of its turns.

Animate plants (Recharges after a Short or Long Rest). Up to four plants the Wraith can see within 60 feet of it magically sprout razor-­edged vines and animate under the wraith's control.

Each animated vine is an object with AC 20, 20 hit points, resistance to bludgeoning damage, and immunity to psychic and thunder damage. When the devil 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 devil is incapacitated or dies.

Tree step(Recharge 4–6). When the vine wraith is standing next to a tree it can step inside and teleport itself to another tree within 100 feet. 

Terrifying Form. When a creature the vine wraith can see starts its turn within 30 feet of the vine wraith, the wraith reveals the terrifying body within the vines. If the creature can see the devil, it must succeed on a DC 14 Wisdom saving throw or be frightened until the end of its turn.