Multiattack

The nihilethic dominator makes three Claw attacks, or it makes two Tendril of the Void attacks.

Claw (Undead Form Only)

Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 12 (2d8 + 3) slashing damage. If the target is a creature, it must succeed on a DC 14 Strength saving throw or be knocked prone.

Tendril of the Void (Void Ghost Form Only)

Melee Weapon Attack: +6 to hit, reach 10 ft., one creature. Hit: 7 (1d8 + 3) cold damage plus 7 (2d6) necrotic damage.