Umbral Shambler

Sunlight Sensitivity. In sunlight disadvantage on attacks and Wis (Perception) checks that use sight.

Tenebrous Agility. Its speed is doubled in dim light or darkness and it doesn't provoke opportunity attacks when it moves provided it moves only in dim light or darkness. In addition when a creature that relies on sight attacks the umbral shambler while the shambler is in dim light or darkness the attacker has disadvantage on the attack roll.

Void Traveler. Doesn't require air food drink sleep or ambient pressure.

Multiattack. Two Claws attacks.

Claws. Melee Weapon Attack: +5 to hit, 5 ft., one target, 5 (1d4+3) slashing damage + 3 (1d6) necrotic.

Twisted Step. Can project itself beyond reality for a short time. Until start of its next turn it can move through objects as if they were difficult terrain provided an object is no more than 3' thick and at least one side of the object is in dim light or darkness. It takes 5 (1d10) force if it starts its turn inside an object.