Amphibious.

The dragon can breathe air and water.

Multiattack.

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

Bite.

Melee Weapon Attack: +8 to hit, reach 10 ft., one target. Hit: 16 (2d10 + 5) piercing damage.

Claw.

Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 12 (2d6 + 5) slashing damage.

Breath Weapons (Recharge 5–6).

The dragon uses one of the following breath weapons.

Lightning Breath. The dragon exhales lightning in a 60-foot line that is 5 feet wide. Each creature in that line must make a DC 15 Dexterity saving throw, taking 55 (10d10) 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 15 Strength saving throw. On a failed save, the creature is pushed 40 feet away from the dragon.

Young Bronze Dragon