Brayalyn the bound one

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

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

curse of fiendish binding. if brayalyn allows someone to escape the chains around her will fassen her into place and will summon an imp to check the situation. after 1 round the imp will either let brayalyn free to pursue the creature(s) again or will throw her into a portal and send out a bone devil after the specified creatures

Multiattack. The devil makes three attacks with its chains.

Chain. Melee Weapon Attack: +8 to hit, reach 10 ft., one target. Hit: 11 (2d6 + 4) slashing damage. The target is grappled (escape DC 14) 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.

Animate Chains (Recharges after a Short or Long Rest). Up to four chains the devil 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 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.

Hand of the Chain Wielder. Brayalyn can cast mending as a bonus action on her turn to heal one chain 10 hp.

Binding Word. Brayalyn utters a word to reduce a creature's speed to 0 on a DC 19 wisdom save. this lasts until the end of her next turn or if the creature is out of her line of sight.

Mask of the Heart. When a creature the devil can see starts its turn within 30 feet of the devil, the devil 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 devil, it must succeed on a DC 14 Wisdom saving throw or be frightened until the end of its turn.