Molydeus

If the molydeus fails a saving throw, it can choose to succeed instead.

The molydeus has advantage on saving throws against spells and other magical effects.

The molydeus' weapon attacks are magical.

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

Melee Weapon Attack +16 to hit, reach 15 ft., one target. 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.

Melee Weapon Attack +16 to hit, reach 10 ft., one target. 16 (2d6 + 9) Piercing damage.

Melee Weapon Attack +16 to hit, reach 15 ft., one creature. 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.

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

The molydeus moves without provoking opportunity attacks.

The molydeus casts one spell from its Innate Spellcasting trait.