Amphibious. The dragon can breathe air and water.
Bite. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 8 (1d10 + 3) piercing damage.
Breath Weapons. The dragon uses one of the following breath weapons.
Lightning Breath. The dragon exhales lightning in a 40-foot line that is 5 feet wide. Each creature in that line must make a DC 12 Dexterity saving throw, taking 16 (3d10) lightning damage on a failed save, or half as much damage on a successful one.
Repulsion Breath. The dragon exhales repulsion energy in a 30-foot cone. Each creature in that area must succeed on a DC 12 Strength saving throw. On a failed save, the creature is pushed 30 feet away from the dragon.