Multiattack. The dragon makes three Bite attacks. It can replace one attack with a Tail attack.
Bite. Melee Attack Roll: +13, reach 15 ft. Hit: 23 (3d10 + 7) Piercing damage plus 7 (2d6) Fire damage. Being underwater doesn't grant Resistance to this Fire damage.
Tail. Melee Attack Roll: +13, reach 15 ft. Hit: 18 (2d10 + 7) Bludgeoning damage. If the target is a Huge or smaller creature, it has the Prone condition.
Steam Breath (Recharge 5-6). Constitution Saving Throw: DC 19, each creature in a 60-foot Cone. Failure: 56 (16d6) Fire damage. Success: Half damage. Failure or Success: Being underwater doesn't grant Resistance to this Fire damage.
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