Unseen. When not being observed, the Abyss Walker gains 70ft. of movement and a +15 Dexterity modifier. 

False Appearance. While motionless, the Abyss Walker is indistinguishable from an inanimate statue

Life Drain. Melee Attack: +5 to hit, reach of 5ft., one target. Hit: 2d8 necrotic damage. A creature that is decreased to 0 HP by this attack is reborn as an Abyss Walker with 15 HP. The spells Dispell Magic, Remove Curse, or Greater Restoration can be used to reverse this transformation. 

Blinding Sight. The Abyss Walker chooses 2 creatures it can see. They must make a DC 14 Wisdom Saving Throw. On a failure, the creature is blinded for 1 minute but can repeat their saving throw at the end of their turn. 

Abyssal Step. Twice per encounter, and as a Bonus Action, the Abyss Walker can cast the spell Misty Step (range 30ft.).