multiattack. the dragon attacks 3 times, once with each of its melee attacks.

bite. Melee Weapon Attack: +5 to hit, reach 5 ft., 1 target. Hit: 26 (3d10 + 5) piercing damage. 

claw. Melee Weapon Attack:+5 to hit, reach 5 ft., 1 target. Hit: 24(3d10+3)piercing damage.

tail. Melee Weapon Attack:+5 to hit, reach 5 ft., 1 target. Hit 22(3d10+1) bludgeoning damage.

fire breath(recharge 5-6). RangedWeapon Attack: +4 to hit, 90-foot cone.,  DC 20 Hit: 100 (1d12 + 20) fire damage on a failed save or half as much on a success

the dragon can take 3 legendary actions.

tail. make a tail attack.

double attack. (2 actions). the dragon makes 1 attack with its claws and 1 with its bite.

fire breath. (3 actions). the dragon makes 1 fire breath attack.