Multiattack. The dragon makes three attacks: one with its bite and two with its claws.

Bite. Melee Weapon Attack: +10 to hit, reach 10 ft., one target. Hit: 18 (2d10 + 67 piercing damage plus 3 (1d6) acid damage.

Claw. Melee Weapon Attack: +10 to hit, reach 5 ft., one target. Hit: 18 (2d6 + 7) slashing damage.

Fire Breath (Recharge 5–6). The dragon exhales fire in a 30-foot line. Each creature in that area must make a DC 17 Dexterity saving throw, taking 42 (12d6) fire damage on a failed save, or half as much damage on a successful one. When the initial line hits an object or creature then all creatures and objects within 5 feet must make a DC 17 Dexterity saving throw, taking 21 (6d6) fire damage on a failed save, or half as much damage on a successful one.