Multiattack

The dragon makes one Bite attack and two Claw attacks.

Bite

Melee Weapon Attack: +10 to hit, reach 10 ft., one target. Hit: 17 (2d10 + 6) piercing damage plus 7 (2d6) poison damage.

Claw

Melee Weapon Attack: +10 to hit, reach 5 ft., one target. Hit: 13 (2d6 + 6) slashing damage.

Poison Breath (Recharge 5-6)

The dragon exhales a cone of black, poisonous gas in a 30-foot cone. Each creature in that area must make a DC 17 Constitution saving throw. On a failure, a creature takes 42 (12d6) poison damage and is poisoned for 1 minute. On a success, a creature takes half the damage and isn't poisoned. A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.