Multiattack

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

Bite

Melee Weapon Attack: +9 to hit, reach 10 ft., one target. Hit: 21 (3d10 + 5) piercing damage plus 4 (1d8) lightning damage.

Claw

Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 14 (2d8 + 5) slashing damage.

Lightning Breath (Recharge 5-6)

The dragon exhales a 60-foot-long 5-foot-wide line of lightning. Each creature in that area makes a DC 16 Dexterity saving throw taking 44 (8d10) lightning damage on a failed save or half damage on a success. A creature that fails the save can't take reactions until the end of its next turn.