MolydeusHuge fiend (demon)
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.
Magic Weapons. The molydeus’s weapon attacks are magical.
Spellcasting. The molydeus uses Divinity (Cha) to cast spells (spell save Difficulty 22, +14 to hit with spell attacks). It has 20 mana, a mana limit of 4, regains all expended mana when it finishes a long rest and regains half its total mana when it finishes a short rest. It knows the following spells:
1 mana: lightning bolt
1/day: minimus imprisonment
Demonic Weapon (1/turn). Melee Weapon Attack: +16 to hit, reach 3 m. 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 (1/turn). Melee Weapon Attack: +16 to hit, reach 2 m. Hit: 16 (2d6 + 9) piercing damage.
Snakebite (1/turn). Melee Weapon Attack: +16 to hit, reach 3 m. Hit: 12 (1d6 + 9) piercing damage, and the target must succeed on a Difficulty 22 Fortitude saving throw or its maximum health 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 maximum health to 0. This transformation can be ended only by a wish spell.
Variant: Summon Devil (1/long rest). As two actions, the molydeus has a 50 percent chance of summoning its choice of 1d6 babaus, 1d4 chasmes, or one marilith. A summoned demon appears in an unoccupied space within 10 meters of the molydeus, acts as an ally of the molydeus, and can’t summon other demons. It remains for 1 minute, until it or the molydeus dies, or until the molydeus dismisses it on its turn (no action required).
Legendary Actions (3)
Only one legendary option can be used at a time and only at the end of another creature’s turn. The molydeus regains spent legendary actions at the start of its turn.
Attack. The molydeus makes one attack, either with its demonic weapon or with its snakebite.
Cast a Spell. The molydeus casts one spell.
Move. The molydeus moves without provoking opportunity attacks.
No concoctions, maneuvers, or spells
All creatures in this system should have maneuvers or spells. You should add some maneuvers or spells to this creature. If you do so, please make a suggestion on github so I can finish adding maneuvers and spells to all creatures via https://github.com/mlenser/kryx-rpg-issues/issues/9.