Alyra, The Bloom Between Worlds

Fey Queen’s Aura. Creatures of Alyra’s choice within 50 feet of her gain advantage on saving throws against being charmed or frightened.
Hostile creatures that begin their turn within the aura must succeed on a DC 22 Wisdom saving throw or be charmed by Alyra until the start of their next turn.
Prophetic Instinct. Alyra always knows when a creature within 60 feet intentionally tells a lie.
Draconic Miracle. Whenever Alyra restores hit points to a creature, radiant draconic magic flows through them. The creature gains temporary hit points equal to Alyra's CHA modifier (8) and sheds dim golden light until the start of its next turn.
Echo of the Dragon. While Alyra is flying, her attacks deal an additional 1d6 radiant damage.

Archfey Spellcasting. Alyra is a 20th-level spellcaster. Her spellcasting ability is Charisma (spell save DC 23, +15 to hit). She requires no material components.
At Will: Guidance, Friends, Minor Illusion, Misty Step, Healing Spirit
3/day each: Calm Emotions, Dispel Magic, Greater Restoration, Wall of Light, Sunbeam
1/day each: Wish, Foresight, True Resurrection

Fey Wings. Alyra possesses radiant fairy wings gifted through a powerful wish. While her wings are unfurled she has a flying speed of 60 feet and can hover. While flying, faint motes of golden light and drifting petals trail behind her.
Winged Grace. While Alyra is flying, she has advantage on Dexterity saving throws.

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

Multiattack. Alyra makes two attacks with her Rainbow Rapier or casts a spell.
Rainbow Rapier. Melee Weapon Attack: +14to hit, reach 5 ft., one target. Hit: (1d8 + 6) piercing damage plus (4d6) radiant damage. On a critical hit, Alyra becomes invisible until end of her next turn.
Spellfire Cone (Recharge 5-6). Exhales radiant spellfire: range 60 ft. cone. Creatures must make a DC 22 Dexterity saving throw, taking 12d6 radiant damage plus 12d6 force damage on a failed save, or half as much damage on a successful one. Illusions in the area become visible until the start of Alyra’s next turn.
Fey Miracle (1/day). Alyra reshapes reality with Fey magic. Choose one effect:
• All allies within 60 ft. regain 50 hit points.
• Alyra immediately takes another turn.
• A dragon spirit appears and fights for her for 1 minute.
• Enemies in a 30 ft radius must succeed on a DC 22 Wisdom save or be polymorphed into harmless animals until the end of their next turn.

Fey Step. Alyra teleports up to 60ft.

Spellfire Shield. When Alyra is hit by an attack, she can surround herself with radiant spellfire, gaining +5 AC against that attack. If the attack misses, the attacker takes 10 (3d6) radiant damage.

Fey Reversal (Recharge 5–6). When a creature Alyra can see within 60 feet succeeds on a saving throw against one of her spells, Alyra can force that creature to reroll the save and take the new result.

Alyra can take 3 legendary actions, choosing from the options below.

Fey Step. Alyra magically teleports up to 60 feet.

Wild Bloom. Vines erupt in a 20-foot radius centered on a point Alyra can see within 60 feet. Creatures must succeed on a DC 21 Strength saving throw or become restrained until the end of their next turn.

Spell Echo (Costs 2 Actions). Alyra repeats the last spell she cast without expending a spell slot.

Bloom Unbound (Mythic Trait).
When Alyra is reduced to 0 hit points, she does not die or fall unconscious. Instead, she explodes into radiant petals and spellfire. Alyra regains 150 hit points, her Fey Queen’s Aura expands to 60 feet, and she enters her Bloom Unbound form. While in this form, Alyra can use her Mythic Actions. Hostile creatures that fail the save are also slowed by creeping vines until the start of their next turn.

Petal Storm (Costs 1 Action). A storm of razor-edged petals erupt around Alyra. Creatures of her choice within 15ft must succeed on a DC 22 DEX saving throw or take 4d8 slashing damage and fall prone.

Spellfire Bloom (Costs 2 Actions). Radiant spellfire blossoms outward from Alyra. Creatures of her choice within 20ft take 4d10 radiant damage, while allies regain 20 hit points.

Dragon's Radiant Roar (Costs 3 Actions). Alyra releases a thunderous draconic roar infused with radiant spellfire. Creature of her choice within 30ft must succeed on a DC 22 WIS saving throw or become frightened until the end of their next turn. Creatures that fail by 5 or more are also knocked prone.