Multiattack

The dragon attacks once with its bite and twice with its claws.

Bite

Melee Weapon Attack: +14 to hit, reach 15 ft., one target. Hit: 29 (4d10 + 7) piercing damage.

Claws

Melee Weapon Attack: +14 to hit, reach 10 ft., one target. Hit: 20 (3d8 + 7) slashing damage.

Torrential Breath (Recharge 5-6)

The dragon exhales water in a 90-foot-long 10-foot-wide line. Each creature in the area makes a DC 20 Dexterity saving throw taking 66 (19d6) bludgeoning damage on a failed save or half damage on a success. A creature that fails the save is also knocked prone and is pushed up to 60 feet away. A creature that impacts a solid object takes an extra 21 (6d6) bludgeoning damage.