Warrior Queen Gith

Special Equipment. Gith carries a magical artifact of the Githyanki known as the Silver Sword of Gith. In the hands of anyone other than Gith, it acts as a +3 greatsword.

While wielding the Silver Sword of Gith, Gith is resistant to psychic damage and has advantage on Intelligence, Wisdom, and Charisma saving throws. It also grants her immunity to the Charmed, Frightened, Incapacitated, Paralyzed, and Stunned conditions. 

Freedom of Movement.  Gith ignores difficult terrain, and magical effects can't reduce her speed or cause her to be restrained. She can spend 5 feet of movement to escape from nonmagical restraints or being grappled.

Chromatic Half-Dragon (Recharge Short or Long Rest). Whenever Gith is reduced to 0 hit points or would otherwise be killed, she transforms into her Half-Dragon state and resets to 600 hit points, in addition to regaining any expended uses of her legendary resistances. Additionally, Gith can now use the options in the "Mythic Actions" section for 1 hour. Award a party an additional 155,000 XP (310,000 XP total) for defeating the aspect of Gith after her Chromatic Half-Dragon Form activates.

Chromatic Aura (Half-Dragon Form only). Gith manifests the mutli-chromatic nature of her half-dragon form to create an aura around her. On initiative count 20, roll a d6 to determine the damage type of her aura: 1 (Fire), 2 (Cold), 3 (Lightning), 4 (Acid), 5 (Poison); on a 6, roll again.

At the start of her turn, any hostile creatures within 5 feet of her suffer 5d6 damage of the corresponding type matching her aura. Additionally, any creature that hits Gith with a melee weapon attack while within 5 feet of her suffers 5d6 damage of the corresponding damage type matching her aura.

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

Multiattack. Gith makes four attacks with the Silver Sword of Gith or ,if Gith has activated her Chromatic Half-Dragon ability, she may instead make a claw attack, a tail attack, and a bite attack.

Silver Sword of Gith. Melee Weapon Attack. +20 to hit, reach 5 ft., one target. Hit: 18 (2d6 + 11) slashing damage plus 10 (3d6) psychic damage. On a critical hit against a target in an astral body (as with the astral projection spell), Gith can cut the silvery cord that tethers the target to its material body, instead of dealing damage.

Claw (Half-Dragon Form). Melee Weapon Attack. +17 to hit, reach 5 ft., one target. Hit: 17 (2d8 + 8) slashing damage plus 17 (5d6) damage of the corresponding damage type matching her aura.

Tail (Half-Dragon Form). Melee Weapon Attack. +17 to hit, reach 10 ft., one target. Hit: 14 (1d12 + 8) bludgeoning damage plus 17 (5d6) damage of the corresponding damage type matching her aura. Additionally the target must make a DC 25 Strength saving throw or be knocked prone.

Bite (Half-Dragon Form). Melee Weapon Attack. +17 to hit, reach 5 ft., one target. Hit: 25 (3d10 + 8) piercing damage.

Astral Step. Gith teleports, along with any equipment she is wearing or carrying, up to 30 feet to an unoccupied space she can see.

Gith can take up to 3 reactions per round, but only one per turn.

Parry. Gith adds 5 AC against one melee attack that would hit her. To do so, Gith must see the attacker and be wielding a melee weapon.

Perniciosa Magum. Whenever Gith sees a creature that she is currently engaged with casting a spell, she may make a single melee weapon attack against the creature. If successful, the targeted creature must make a DC 25 Constitution saving throw. On a successful save, the target casts the spell as normal. On a failed save, the target is unable to complete the casting of spell; the spell slot is consumed as normal.

Gith can take 4 legendary actions, choosing from the options below. Only one legendary action can be used at a time and only at the end of another creature's turn. Gith regains spent legendary actions at the start of her turn.

Silver Sword of Gith. Gith makes one melee weapon attack with her Silver Sword of Gith.

Astral Step. Gith uses her Astral Step ability to teleport 30 feet.

Conqueror's Presence (Costs 2 Actions). Gith chooses a creature that she can see within 120 feet of her.

If that creature is hostile towards Gith, she attempts to impose her will over them and the creature must make a DC 24 Wisdom saving throw. On a failed save, the creature loses its will to fight, imposing disadvantage on all attack rolls and saving throws until the end of their next turn. A creature is unaffected by this ability if they are immune to the frightened condition.

If the targeted creature is an ally to Gith, she imbues them with her warrior's spirit, granting them advantage on attack rolls and saving throws until the end of their next turn.

Tail or Claw attack (Costs 2 Actions). Gith makes one melee weapon attack using her tail or her claws.

Draconic Might (Costs 3 Actions). Gith wills the aura surrounding her to condense around her before exploding outwards. All creatures within 20 ft. of her must make a DC 25 Dexterity saving throw, or suffer 26 (4d12) damage of a type matching Gith's aura.