Basic Rules, pg. 288
Bite. Melee Weapon Attack: 1d20+6 to hit, reach 5 ft., one target. Hit: 9 1d10+4 piercing damage plus 3 1d6 fire damage. Fire Breath (Recharge 5–6). The dragon exhales fire in a 15-foot cone. Each creature in that area must make a DC 13 Dexterity saving throw, taking 24 7d6 fire damage on a failed save, or half as much damage on a successful one.