Skeletron (5e Creature)
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Huge undead, neutral evil
Saving Throws Str +9, Wis +7
Arms. Skeletron has two floating arms. Each arm can be attacked (AC 16; 40 hit points; immunity to necrotic, poison, and psychic damage); destroying an arm deals no damage to skeletron. For each arm skeletron has, it gains a +2 bonus to its AC and an extra reaction that can be used only for opportunity attacks.
Magic Resistance. Skeletron has advantage on saving throws against spells and other magical effects.
Magic Weapons. Skeletron's weapon attacks are magical.
Multiattack. Skeletron makes one bite attack, and one skeletal hand attack for each arm it has.
Bite. Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 13 (2d8 + 4) piercing damage.
Skeletal Hand. Melee Weapon Attack: +9 to hit, reach 15 ft., one target. Hit: 10 (2d6 + 3) bludgeoning damage, and the target is grappled (escape DC 16). Until this grapple ends, the target is restrained. Skeletron can grapple one target for each arm it has.
Cursed Skull. Ranged Spell Attack: +9 to hit, range 30/60 ft., one creature. Hit: 4 (1d8) necrotic damage, and the target must succeed on a DC 12 Wisdom saving throw or become frightened until the end of its next turn. If the target fails the saving throw by 5 or more, it is also stunned for the same duration.
The skeletron can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature's turn. The skeletron regains spent legendary actions at the start of its turn.
Attack. Skeletron makes one cursed skull attack.
The disembodied bones of a former tyrant pulsed with a hatred so strong, it left behind a mighty curse which guards the haunted dungeon that is the only remnant of its once-mighty fortress. Skeletron is a massive human skull and pair of skeletal arms whose joints constantly drip blood. It manifests by bursting forth from within the cursed protector of the dungeon's entrance, either to protect the only thing left of the empire it ruled in life, or to battle those foolish to come seeking the challenge and glory of battling such a fearsome evil being.
Undead Nature. Skeletron doesn't require air, food, drink, or sleep.