Amphibious. Lhammaruntosz can breathe air and water.

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

Regeneration. Lhammaruntosz regains 5 hit points at the start of her turn.

Innate Spellcasting. Lhammaruntosz's spellcasting ability is Charisma (spell save DC 17). She can innately cast the following spells, requiring no material components:

1/day each: create food and water, detect thoughts, fog cloud, speak with animals

Spellcasting. Lhammaruntosz is an 8th-level spellcaster. Her spellcasting ability is Charisma (spell save DC 17; +9 to hit with spell attacks). She has the following sorcerer spells prepared:

Cantrips (at will): light, mage hand, mending

1st level (4 slots): charm person, detect magic, expeditious retreat, sleep

2nd level (3 slots): darkness, invisibility, suggestion

3rd level (3 slots): dispel magic, protection from energy

4th level (2 slots): dimension door, stoneskin

Multiattack. Lhammaruntosz can use her Frightful Presence. She then makes three attacks: one with her bite and two with her 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.

Tail. Melee Weapon Attack: +12 to hit, reach 15 ft., one target. Hit:16 (2d8 + 7) bludgeoning damage.

Frightful Presence. Each creature of Lhammaruntosz's choice that is within 120 feet of her and aware of her 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 Lhammaruntosz's Frightful Presence for the next 24 hours.

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

Lightning Breath. Lhammaruntosz 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.

Repulsion Breath. Lhammaruntosz 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.

Detect. Lhammaruntosz makes a Wisdom (Perception) check.

Tail Attack. Lhammaruntosz makes a tail attack.

Wing Attack (Costs 2 Actions). Lhammaruntosz beats its wings. Each creature within 10 feet of Lhammaruntosz must succeed on a DC 20 Dexterity saving throw or take 14 (2d6 + 7) bludgeoning damage and be knocked prone. Lhammaruntosz can then fly up to half her flying speed.