Bladed Shadow

Shadow Stealth. While in dim light or darkness, the shadow can take the Hide action as a bonus action.

Sunlight Weakness. While in sunlight, the shadow has disadvantage on attack rolls, ability checks, and saving throws.

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

Multiattack. The shadow can do two attacks with the Nightmare Slash or one Reaping Dance

Nightmare Slash. Melee Weapon Attack: +5 to hit, reach 5 ft., one creature. Hit: 9 (2d6 + 3) necrotic damage. The target must make a Wisdom saving throw (DC 13) or be frightened for 1 minute. A frightened target can repeat the saving throw at the end of each of its turns, with disadvantage if the bladed shadow is within line of sight, ending the effect on itself on a success. If a target’s saving throw is successful or the effect ends for it, the target is immune to the bladed shadow’s Nightmare Slash for the next 24 hours.

Reaping Dance. Melee Weapon Attack: +5 to hit, 5ft radius. Hit: 9 (2d6+3) necrotic damage to each creature hit and heals for half of damage dealt.

Darkness (1/day).  The shadow can cast darkness.