Unstable. When killed explodes dealing (2d6 + 2) necrotic damage in a 10ft radius.

Shadow Manipulation. Can uses the shadows to travel up to 50ft where another shadow is located. (Recharge 6)

Spellcasting. The Void Elemental is a 3-level spellcaster. Its spellcasting ability is Wisdom (spell save DC 18, Ability scores: Attack: +6 to hit with ranged spell attacks). The Void Elemental has following Warlock spells prepared:
Cantrips (at will): Eldritch Blast (1d10 + 6), Minor Illusion
1st level (3 slots): Charm Person , Hex (1d6 + 6) , Comprehend Languages

2nd level (2 slots): Darkness

Multiattack. Attacks two times with Void Swipe.

Void Swipe. Melee Weapon Attack: +3 to hit, reach 5 ft., 1 target. Hit: 12 (2d8 + 3) bludgeoning damage.

Repel. Ranged Weapon Attack: +3 to hit, range 10/30 ft., 4 targets at a time. Hit: # (1d8 + 3) bludgeoning damage if they come in contact with a hard surface. Shoves the creature back up 30ft unless succeeding a 15 Con DC.

Combine. Combines with its master (e.g. cultist or whoever summoned it) and restores the masters health by (2d10).

Abyssal Communication. Communicates with the Abyss to gain +5 to any Wisdom saving throws.