Attacks:

When they gain access to multi-attack, cannot use the same ability twice in one round.

Bite. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit:  (1d6 + 3) piercing damage plus (1d4) lightning damage.

Tail. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit:  (1d8 + 3) bludgeoning damage.

Claw. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: (1d4 + 3) slashing damage.

Lightning Breath (Recharge 5–6). The dragon exhales lightning in an 30-foot line that is 5 feet wide. Each creature in that line must make a DC 10 Dexterity saving throw, taking (2d6) lightning damage on a failed save, or half as much damage on a successful one.