Armor Class 19 (natural armor)
Hit Points 216 (16d12 + 112)
Speed 40 ft.
Saving Throws STR +16, CON +14, WIS +14, CHA +14
Skills Perception +21
Damage Resistances cold, fire, lightning, [object Object]
Damage Immunities poison
Condition Immunities blinded, charmed, deafened, frightened, poisoned, stunned
Senses truesight 120 ft., passive Perception 31
Languages Abyssal, telepathy 120 ft.
Challenge 21
Legendary Resistance (3/Day). If the molydeus fails a saving throw, it can choose to succeed instead.
Magic Resistance. The molydeus has advantage on saving throws against spells and other magical effects.
Multiattack. The molydeus makes one Demonic Weapon attack, one Snakebite attack, and one Wolf Bite attack.
Demonic Weapon. Melee Weapon Attack: +16 to hit, reach 15 ft., one target. Hit: 35 (4d12 + 9) force damage. If the target has at least one head and the molydeus rolled a 20 on the attack roll, the target is decapitated and dies if it can't survive without that head. A target is immune to this effect if it takes none of the damage, has legendary actions, or is Huge or larger. Such a creature takes an extra 27 (6d8) force damage from the hit.
Snakebite. Melee Weapon Attack: +16 to hit, reach 15 ft., one creature. Hit: 16 (2d6 + 9) poison damage. The target must succeed on a DC 22 Constitution saving throw, or its hit point maximum is reduced by an amount equal to the damage taken. This reduction lasts until the target finishes a long rest. The target transforms into a manes if this reduces its hit point maximum to 0. This transformation can be ended only by a wish spell.
Wolf Bite. Melee Weapon Attack: +16 to hit, reach 10 ft., one target. Hit: 25 (3d10 + 9) necrotic damage.
Attack. The molydeus makes one Demonic Weapon or Snakebite attack.
Move. The molydeus moves without provoking opportunity attacks.
Cast a Spell (Costs 2 Actions). The molydeus uses Spellcasting.
Mordenkainen Presents: Monsters of the Multiverse, p. 184