Aeorian Nullifier

Large Monstrosity - Neutral Evil
Armor Class: 17 (natural armor)
Hit Points: 180 (19d10+76)
Speed: 40ft
STR - 19, DEX - 14, CON - 18, WIS - 14, INT - 7, CHA - 18
Saving Throws: WIS +6, CHA +8
Skills: Perception +6, Survival +6
Damage Immunities: Necrotic, Radiant
Senses: Darkvision 120ft, Passive Perception 16
Languages: Understands Draconic but can't speak
Challenge: 12
Traits
Horrid Gnashing - The nullifier's mouths gnash incoherently while it can see any enemies. Each creature that starts its turn within 20 feet of the nullifier and can hear it must make a DC 16 Wisdom saving throw. Unless the save succeeds, the creature rolls a d8 to determine what it does during the current turn: 1-4: The creature is stunned until the end of the turn. 5-6: The creature is frightened until the end of the turn and uses its movement to get as far as possible from the nullifier. 7-8: The creature doesn't move, and it uses its action to make one melee attack against a random creature (other than itself) if one is within reach. It otherwise does nothing.
Magic Resistance - The nullifier has advantage on saving throws against spells and other magical effects.
Actions
Multiattack - The nullifier makes three attacks: one with its bites and two with its claws.
Bites - Melee Weapon Attack: +8 to hit, reach 5 ft., one creature. Hit: 17 (2d12 + 4) piercing damage plus 11 (2d10) force damage.
Claws - Melee Weapon Attack: +8 to hit, reach 10 ft., one target. Hit: 11 (2d6 + 4) slashing damage plus 11 (2d10) force damage, and the target is grappled (escape DC: 16) if it's a creature. The nullifier has two claws, each of which can grapple one creature.