Spellcasting. Instead of taking bite or claw attacks, you can choose to cast one of the spells from the list below, using your spellcasting modifier and spellcasting save DC. 

1/Day: Aid, Command, Dispel Magic, Mass Healing Word

2/Day: Bless, Shield of Faith, Tongues

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

Bite. Melee Weapon Attack: +7 to hit, reach 10 ft., one target. Hit: 10  (1d10 + 4) piercing damage.

Claw. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 11 (2d6 + 4) slashing damage.

Breath Weapons (Recharge 6).The dragon uses one of the following breath weapons.

Fire Breath. The dragon exhales fire in a 40-foot line that is 5 feet wide. Each creature in that line must make a DC 14 Dexterity saving throw, taking 30 (8d6) fire damage on a failed save, or half as much damage on a successful one.

Tail Attack. You may use your bonus action to make one bonus action tail attack. 

Tail. Melee Weapon Attack: +7 o hit; reach 15 ft., one target. Hit: 10 (1d10 +4) bludgeoning damage. The target needs to make a DC 14 Strength saving throw or be knocked prone.