Skeleton Dragon (5e Creature)
From D&D Wiki
Gargantuan undead, neutral evil
Damage Vulnerabilities bludgeoning
Limited Telepathy. The skeleton can magically transmit simple messages and images to any creature within 120 feet of it that can understand a language. This form of telepathy doesn't allow the receiving creature to telepathically respond.
Multiattack. The skeleton makes four attacks: one with its bite, two with its claw, and one with its tail.
Bite. Melee Weapon Attack: +13 to hit, reach 5 ft., one target. Hit: 19 (2d10 + 8) piercing damage. The target's hit point maximum is reduced by an amount equal to the damage taken, and the skeleton regains hit points equal to that amount. The reduction lasts until the target finishes a long rest. The target dies if this effect reduces its hit point maximum to 0.
Claw. Melee Weapon Attack: +13 to hit, reach 5 ft., one target. Hit: 15 (2d6 + 8) slashing damage.
Tail. Melee Weapon Attack: +13 to hit, reach 15 ft., one target. Hit: 17 (2d8 + 8) bludgeoning damage.
The work of necromancers can be quite terrifying if left unchecked. Necromancers got their hands on dragon bones and this is an example of what can happen to the remains of such a creature if they are not properly hidden.
Undead Nature. A skeleton dragon doesn't require air, food, drink, or sleep.