Psychic Resilience. Whenever Menyar-Ag fails a saving throw, he can choose to succeed instead. Whenever Menyar-Ag succeeds on a saving throw in this manner, he regains two less legendary actions at the start of his next turn.

Strike at the Mind. Menyar-Ag's weapon attacks are considered magical, and deal an extra 22 (4d10) psychic damage on a hit (included in the attack). Additionally, whenever Menyar-Ag deals psychic damage to a creature normally immune, it is instead resistant. Whenever Menyar-Ag deals psychic damage to a creature normally resistant, it is instead not resistant.

Psionic Bastion. Menyar-Ag constantly emits a field of psychic energy that benefits himself, and hinders his adversaries. Menyar-Ag adds his Intelligence modifier to his AC, uses his Intelligence score to determine his weapon attack and damage rolls, and whenever a creature makes a spell attack against him, it does so with disadvantage. Additionally, creatures that start their turn within 120 feet of Menyar-Ag can't be resistant to force damage.

Disruptive Field. Menyar-Ag's immense psionic power hinders those that attempt to use magic against him. Whenever a creature of Menyar-Ag's choice casts a spell within 120 feet of him, it must first make a DC 25 Constitution saving throw (as if concentrating on the spell). On failed saving throw, the affected creature is unable to cast the spell and must use its action, bonus action, or reaction to do something else. On a successful save, an affected creature takes 22 (4d10) psychic damage.

Multiattack. Menyar-Ag uses Mind-Shattering Palm (if available), Spellcasting, or Telekinetic Grasp. He then makes two Unarmed Strikes.

Unarmed Strike. Melee Weapon Attack: +17 to hit, reach 5 ft., one target. Hit: 18 (2d8 + 9) bludgeoning damage plus 22 (4d10) psychic damage. If the target is a creature, it suffers one of the following additional effects (Menyar-Ag's choice).
Forceful Hand. The target is pushed 15 feet beackwards, falling prone.
Shock the System. The target can't take reactions until the end of Menyar-Ag's next turn.
Stunning Blow. The target must make a DC 25 Constitution saving throw or be stunned until the end of Menyar-Ag's next turn on a failed save.

Telekinetic Grasp. Menyar-Ag lashes out with his psionic power, forcing each creature of his choice within 60 feet of him to make a DC 25 Strength saving throw or be grappled and restrained (escape DC 25) until the grapple is broken. While grappled and restrained in this manner, an affected creature takes 34 (4d12 + 8) force damage at the start of each of its turns as Menyar-Ag's mind crushes its form.

Spellcasting (Psionics). Menyar-Ag casts one of the following spells, requiring no spell components and using Intelligence as the spellcasting ability. If any spell cast by Menyar-Ag is lower than 4th level, it is instead cast at 4th level (save DC 25):

At-will: blur, catapult, detect magic, detect thoughts, magic missile
3/day each: confusion, dispel magic, dominate monster, greater invisibility, hold monster, scatter
1/day each: astral projection, etherealness, feeblemind,  forcecage, foresight, psychic scream

Mind-Shattering Palm (Recharge 5-6). Menyar-Ag empowers his palm with pure psionic energy and attempts to strike at a creatures mind directly. Menyar-Ag makes an Unarmed Strike at a creature within range, the AC of the target for this attack is 10 + its Intelligence modifier. On a hit, the target suffers the effects and damage of the Unarmed Strike plus an extra 55 (10d10) psychic damage and it must make a DC 25 Intelligence saving throw. On a failed saving throw, an affected creatures Intelligence score is reduced to 1 until it receives magical healing of 8th level or higher. On a successful saving throw, an affected creatures Intelligence score is reduced by 1d4 until the end of Menyar-Ag's next turn.

Psi-Step. Menyar-Ag takes the Dash, Disengage, and Dodge actions (in any order) then teleports to an unoccupied space he is aware of within 60 feet of him.

Telekinetic Shield. As a reaction to taking damage, Menyar-Ag can reduce the damage dealt by 35 (10d6). If this reduces the damage dealt to 0, each creature of Menyar-Ag's choice within 30 feet of him takes 11 (2d10) force damage and is pushed 25 feet backwards.

Menyar-Ag 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. Menyar-Ag regains spent legendary actions at the start of his turn.

Strike. Menyar-Ag makes an Unarmed Strike.

Psionic Will (Costs 2 Actions). Menyar-Ag uses Spellcasting, or Telekinetic Grasp.

Shatter the Mind (Costs 3 Actions). Menyar-Ag recharges, or uses his Mind-Shattering Palm action.