Armor Class 17 (natural armor)
Hit Points 180 (19d10 + 76)
Speed 40 ft.
Saving Throws WIS +6, CHA +8
Skills Perception +6, Survival +6
Damage Immunities necrotic, radiant
Senses darkvision 120 ft., passive Perception 16
Languages understands Draconic but can't speak
Challenge 12
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:
Magic Resistance. The nullifier has advantage on saving throws against spells and other magical effects.
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.
Counterspell. The nullifier attempts to interrupt a creature that it can see within 60 feet in the process of casting a spell. If the creature is casting a spell of 3rd level or lower, its spell fails and has no effect. If it is casting a spell of 4th level or higher, the nullifier makes a Charisma check with a DC equal to 10 + the spell's level. On a success, the creature's spell fails and has no effect.
Explorer's Guide to Wildemount, p. 283