Amphibious. Runara can breathe air and water.

Legendary Resistance (3/Day). If Runara fails a saving throw, it can choose to succeed instead.

Multiattack. Runara can use its Frightful Presence. It then makes three attacks: one with its bite and two with its claws.

Bite. Melee Weapon Attack: +12 to hit, reach 10 ft., one target. Hit:18 (2d10 + 7) piercing damage.

Claw. Melee Weapon Attack: +12 to hit, reach 5 ft., one target. Hit:14 (2d6 + 7) slashing damage.

Frightful Presence. Each creature of Runara's choice that is within 120 feet of the dragon and aware of it must succeed on a DC 17 Wisdom saving throw or become frightened for 1 minute. A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. If a creature's saving throw is successful or the effect ends for it, the creature is immune to the dragon's Frightful Presence for the next 24 hours.

Breath Weapons (Recharge 5–6). Runara uses one of the following breath weapons.

• Runara exhales lightning in a 90-foot line that is 5 feet wide. Each creature in that line must make a DC 19 Dexterity saving throw, taking 66 (12d10) lightning damage on a failed save, or half as much damage on a successful one.
• Runara exhales repulsion energy in a 30-foot cone. Each creature in that area must succeed on a DC 19 Strength saving throw. On a failed save, the creature is pushed 60 feet away from the dragon.

Change Shape. Runara magically transforms into a Humanoid or Beast that is Medium or Small, while retaining her game statistics (other than her size). This transformation ends if Runara is reduced to 0 hit points or uses a bonus action to end it.