Multiattack. The molydeus makes three attacks: one with its weapon, one with its wolf bite, and one with its snakebite.

Demonic Weapon. Melee Weapon Attack: +16 to hit, reach 15 ft., one target. Hit: 20 (2d10 + 9) slashing 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 6d8 slashing damage from the hit.

Wolf Bite. Melee Weapon Attack: +16 to hit, reach 10 ft., one target. Hit: 16 (2d6 + 9) piercing damage.

Snakebite. Melee Weapon Attack: +16 to hit, reach 15 ft., one creature. Hit: 12 (1d6 + 9) piercing damage, and 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.

Attack. The molydeus makes one attack, either with its demonic weapon or with its snakebite.

Move. The molydeus moves without provoking opportunity attacks.

Cast a Spell. The molydeus casts one spell from its Innate Spellcasting trait.