Xinella

Discorporation. When Xinella drops to 0 hit points or dies, her body is destroyed but her essence travels back to her domain in the Astral plane, and she is unable to take physical form for a time.

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

Regeneration. If Xinella has at least 1 hit point, she regains 30 hit points at the start of her turn.

Magic Weapons. Xinella’s weapon attacks are magical.

Innate Spellcasting . Xinella's spellcasting ability is Intelligence (spell save DC 26, +16 to hit with spell attacks). She can innately cast the following spells, requiring no material components:

At will: frostbite (17th level ), color spray, detect magic

3/day each: conjure celestial, hallucinatory terrain,

1/day: wish

Limited Magical Resistance. Unless she wishes to be affected, Xinella is immune to spells of 7th level or lower. She has advantage on saving throws against all other spells and magical effects.

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

Bite. Melee Weapon Attack: +19 to hit, reach 15 ft., one target. Hit: 32 (4d10 + 10) piercing damage plus 14 (4d6) cold damage.

Claw. Melee Weapon Attack: +19 to hit, reach 10 ft., one target. Hit: 24 (4d6 + 10) slashing damage.

Tail. Melee Weapon Attack: +19 to hit, reach 20 ft., one target. Hit: 28 (4d8 + 10) bludgeoning damage.

Frightful Presence. Each creature of the Xinella's choice that is within 120 feet of the dragon and aware of it must succeed on a DC 21 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 Xinella's Frightful Presence for the next 24 hours.

Breath Weapons . Xinella uses one of the following breath weapons.

Cold Breath. Xinella breathes an icy blast in a 90-foot cone. Each creature in that area must make a DC 27 Dexterity saving throw, taking 72 (16d8) cold damage on a failed save, or half as much damage on a successful one.

Paralyzing Breath. Xinella exhales paralyzing gas in a 90-foot cone. Each creature in that area must succeed on a DC 27 Constitution saving throw or be paralyzed 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.

Change Shape. Xinella magically polymorphs into a humanoid or beast that has a challenge rating no higher than her own, or back into her true form. She reverts to her true form if she dies. Any equipment it is wearing or carrying is absorbed or borne by the new form (the Xinella's choice).

In a new form, Xinella retains its alignment, hit points, Hit Dice, ability to speak, proficiencies, Legendary Resistance, lair actions, and Intelligence, Wisdom, and Charisma scores, as well as this action. Her statistics and capabilities are otherwise replaced by those of the new form, except any class features or legendary actions of that form.

Xinella can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature's turn. Xinella regains spent legendary actions at the start of her turn.

Detect. Xinella makes a Wisdom (Perception) check.

Tail Attack. Xinella makes a tail attack.

Wing Attack (Costs 2 Actions). Xinella beats her wings. Each creature within 15 feet of Xinella must succeed on a DC 25 Dexterity saving throw or take 17 (2d6 + 10) bludgeoning damage and be knocked prone. Xinella can then fly up to half her flying speed.