Bahamut, the Platinum Dragon (TEoH)

Divine Weapons. Bahamut ignores all damage Resistances and Immunities.

Legendary Resistance. Bahamut has Advantage on all saving throws.

Regeneration. Bahamut regains 20 Hit Points at the start of his turn.

Multiattack. Bahamut makes 3 Rend attacks. He can replace one of these attacks with a use of Spellcasting to cast

Rend. Melee Attack Roll: +19, reach 30 ft. Hit: 36 (4d12 + 10) Force damage.

Platinum Breath (Recharge 5–6). Dexterity Saving Throw: DC 26, each creature in a 180-foot Cone. Failure: 78 (12d12) Radiant damage. Success: Half damage only.

Sapping Breath. Constitution Saving Throw: DC 26, each creature in a 180-foot Cone. Failure: The target has the Unconscious condition until the end of its next turn.

Spellcasting. Bahamut casts one of the following spells, requiring no Material components and using Charisma as the spellcasting ability (spell save DC 27, +19 to hit with spell attacks):

At Will: Conjure Celestial, Guiding Bolt (level 4 version) Mass Cure Wounds, Wall of Force
1/Day Each: Power Word Heal, Shapechange

Legendary Action Uses: 3. Immediately after another creature’s turn, Bahamut can expend a use to take one of the following actions. Bahamut regains all expended uses at the start of each of his turns.

Divine Domain Expansion. Bahamut uses Spellcasting to cast Wall of Force.

Pounce. Bahamut moves up to half his Speed, and he makes one Rend attack.

Shining Presence. Charisma Saving Throw: DC 26, one creature Bahamut can see within 200 feet. Failure: The target has the Blinded condition until the end of its next turn.