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

Bite. Melee Weapon Attack: +9 to hit, reach 10 ft., one target. Hit: 16 (2d10 + 5) piercing damage plus 5 (1d10) lightning damage.

Claw. Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 12 (2d6 + 5) slashing damage plus 3(1d6) fire damage.

Lightning Breath (Recharge 5–6). The dragon exhales lightning in an 90-foot line that is 5 feet wide. Each creature in that line must make a DC 16 Dexterity saving throw, taking 44(8d10) lightning damage on a failed save, or half as much damage on a successful one.

Fire Breath (Recharge 5–6). The dragon exhales fire in  a 60-foot cone. Each creature in that area must make a DC 16 Dexterity saving throw, taking  42 (12d6) fire damage on a failed save, or half as much damage on a successful one.