Magic Resistance. Ẍ̷̫́ž̴̛͙̠̘ỳ̵̗̓͠t̷͈͔͌̈́ĥ̸̻̮͐ḯ̵̤͈̹͓ơ̸̞̱͒̊͘ͅr̴̨̗̽̽͜ has advantage on saving throws against spells and other magical effects that don't do radiant damage.

Magic Weapons. Ẍ̷̫́ž̴̛͙̠̘ỳ̵̗̓͠t̷͈͔͌̈́ĥ̸̻̮͐ḯ̵̤͈̹͓ơ̸̞̱͒̊͘ͅr̴̨̗̽̽͜'s weapon attacks are magical.

Legendary Resistance (5/Day). If Ẍ̷̫́ž̴̛͙̠̘ỳ̵̗̓͠t̷͈͔͌̈́ĥ̸̻̮͐ḯ̵̤͈̹͓ơ̸̞̱͒̊͘ͅr̴̨̗̽̽͜ fails a saving throw, it can choose to succeed instead.

Absorb Essence. If a creature would die as a result of damage from Ẍ̷̫́ž̴̛͙̠̘ỳ̵̗̓͠t̷͈͔͌̈́ĥ̸̻̮͐ḯ̵̤͈̹͓ơ̸̞̱͒̊͘ͅr̴̨̗̽̽͜, their soul is instead trapped inside of one of Ẍ̷̫́ž̴̛͙̠̘ỳ̵̗̓͠t̷͈͔͌̈́ĥ̸̻̮͐ḯ̵̤͈̹͓ơ̸̞̱͒̊͘ͅr̴̨̗̽̽͜'s Void Plates. Whenever a soul enters a Void Plate, Ẍ̷̫́ž̴̛͙̠̘ỳ̵̗̓͠t̷͈͔͌̈́ĥ̸̻̮͐ḯ̵̤͈̹͓ơ̸̞̱͒̊͘ͅr̴̨̗̽̽͜ gains 2 temporary hit points for each of the targets levels or challenge rating. When a Void Plate is destroyed, all the souls inside of that plate are released and can either be resurrected or pass on to the afterlife.

Void Plates. Before Ẍ̷̫́ž̴̛͙̠̘ỳ̵̗̓͠t̷͈͔͌̈́ĥ̸̻̮͐ḯ̵̤͈̹͓ơ̸̞̱͒̊͘ͅr̴̨̗̽̽͜ can be killed, the plates that hover over him must be destroyed. There are 4 plates, and each plate has an Armor Class of 18, and 200 hit points. When a plate is destroyed, any souls trapped in that plate are freed, and Ẍ̷̫́ž̴̛͙̠̘ỳ̵̗̓͠t̷͈͔͌̈́ĥ̸̻̮͐ḯ̵̤͈̹͓ơ̸̞̱͒̊͘ͅr̴̨̗̽̽͜ loses 10 hit points for each soul trapped in that plate.

Mind of the Far Realm. Ẍ̷̫́ž̴̛͙̠̘ỳ̵̗̓͠t̷͈͔͌̈́ĥ̸̻̮͐ḯ̵̤͈̹͓ơ̸̞̱͒̊͘ͅr̴̨̗̽̽͜  is immune to any effect that would sense its emotions or read its thoughts, Divination Spells, and the Charmed condition. This ability even foils wish spells and spells or effects of similar power used to affect Ẍ̷̫́ž̴̛͙̠̘ỳ̵̗̓͠t̷͈͔͌̈́ĥ̸̻̮͐ḯ̵̤͈̹͓ơ̸̞̱͒̊͘ͅr̴̨̗̽̽͜ 's mind or to gain information about the target. If any creature attempts to use a spell or ability to affect Ẍ̷̫́ž̴̛͙̠̘ỳ̵̗̓͠t̷͈͔͌̈́ĥ̸̻̮͐ḯ̵̤͈̹͓ơ̸̞̱͒̊͘ͅr̴̨̗̽̽͜ 's mind, the creature must make an Intelligence saving throw or take 6d12 psychic damage and go insane. While insane, the creature can’t take actions, bonus actions, or reactions, can’t understand what other creatures say, can’t read, and can speak only in gibberish. A greater restoration spell cast on the creature ends this effect. 

Regeneration. If Ẍ̷̫́ž̴̛͙̠̘ỳ̵̗̓͠t̷͈͔͌̈́ĥ̸̻̮͐ḯ̵̤͈̹͓ơ̸̞̱͒̊͘ͅr̴̨̗̽̽͜ has at least 1 hit point, it regains 50 hit points at the start of its turn.

Bane of Time. For each minute that passes within 100 miles of Ẍ̷̫́ž̴̛͙̠̘ỳ̵̗̓͠t̷͈͔͌̈́ĥ̸̻̮͐ḯ̵̤͈̹͓ơ̸̞̱͒̊͘ͅr̴̨̗̽̽͜, an hour passes outside of that radius.

Innate Spellcasting. Ẍ̷̫́ž̴̛͙̠̘ỳ̵̗̓͠t̷͈͔͌̈́ĥ̸̻̮͐ḯ̵̤͈̹͓ơ̸̞̱͒̊͘ͅr̴̨̗̽̽͜'s innate spellcasting ability is intelligence (spell save DC 20). It can innately cast the following spells, requiring no components:

At will: detect thoughts, darkness, silence, cause fear, tasha's mind whip, hallucinatory terrain, telekinesis, phantasmal force

3/day each: dispel magic, counterspell, dominate monster, slow, phantasmal killer, dominate person, synaptic static, fear, gravity fissure, raulothim's psychic lance

2/day each: finger of death, power word pain, time ravage, reality break, dark star, storm of vengeance, psychic scream, feeblemind, maddening darkness, reverse gravity, ravenous void, plane shift, mass suggestion

Multiattack. Ẍ̷̫́ž̴̛͙̠̘ỳ̵̗̓͠t̷͈͔͌̈́ĥ̸̻̮͐ḯ̵̤͈̹͓ơ̸̞̱͒̊͘ͅr̴̨̗̽̽͜ makes four tentacle attacks, and may forfeit up to two of those attacks to cast spells. It can forfeit an additional attack to use its Psionic Rend, Obliterate Mind, or Presence of the Far Realm.

Tentacle. Melee Weapon Attack: +15 to hit, reach 20 ft., one creature. Hit: 50 (4d12 + 12) psychic damage. If the target is huge or smaller, it is grappled (escape DC 15) and must succeed on a DC 19 Intelligence saving throw or be stunned until this grapple ends.

Psionic Rend (Recharge 5–6). Ẍ̷̫́ž̴̛͙̠̘ỳ̵̗̓͠t̷͈͔͌̈́ĥ̸̻̮͐ḯ̵̤͈̹͓ơ̸̞̱͒̊͘ͅr̴̨̗̽̽͜ emits a blast of mind-shattering energy in a 80-foot cone. Each creature in that area must succeed on a DC 19 Intelligence saving throw or take 70 (8d10 + 30) psychic damage and be stunned 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.

Presence of the Far Realm. Each creature of  Ẍ̷̫́ž̴̛͙̠̘ỳ̵̗̓͠t̷͈͔͌̈́ĥ̸̻̮͐ḯ̵̤͈̹͓ơ̸̞̱͒̊͘ͅr̴̨̗̽̽͜'s choice that is within 120 feet of him and aware of him must succeed on a DC 19 Wisdom saving throw or become frightened of it 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 Ẍ̷̫́ž̴̛͙̠̘ỳ̵̗̓͠t̷͈͔͌̈́ĥ̸̻̮͐ḯ̵̤͈̹͓ơ̸̞̱͒̊͘ͅr̴̨̗̽̽͜'s Presence of the Far Realm for the next 24 hours.

Obliterate Mind. (Recharge 6). Ẍ̷̫́ž̴̛͙̠̘ỳ̵̗̓͠t̷͈͔͌̈́ĥ̸̻̮͐ḯ̵̤͈̹͓ơ̸̞̱͒̊͘ͅr̴̨̗̽̽͜ targets a creature that he can see within 60 feet of him. That creature must make a DC 17 intelligence saving throw. On a failure, the creature takes  (8d10) psychic damage, and they must repeat the saving throw as their mind is shattered. On a a failure, their intelligence and charisma scores become 1 until a greater restoration, heal or wish is cast on them.

Ẍ̷̫́ž̴̛͙̠̘ỳ̵̗̓͠t̷͈͔͌̈́ĥ̸̻̮͐ḯ̵̤͈̹͓ơ̸̞̱͒̊͘ͅr̴̨̗̽̽͜ can take 4 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. Ẍ̷̫́ž̴̛͙̠̘ỳ̵̗̓͠t̷͈͔͌̈́ĥ̸̻̮͐ḯ̵̤͈̹͓ơ̸̞̱͒̊͘ͅr̴̨̗̽̽͜ regains spent legendary actions at the start of its turn.

Psionic Strike. Melee Weapon Attack: +15 to hit, reach 15 ft., one target. Hit: 40 (4d10+ 10) necrotic damage.

Abberant Arcana. Ẍ̷̫́ž̴̛͙̠̘ỳ̵̗̓͠t̷͈͔͌̈́ĥ̸̻̮͐ḯ̵̤͈̹͓ơ̸̞̱͒̊͘ͅr̴̨̗̽̽͜ casts a spell from its Innate Spellcasting list.

Mana Drain. (Recharge 5-6). Each creature that has spell slots in an 80-foot cone must make a Constitution saving throw. On a failure, those creatures lose spell slots of a combined level of 1d8 (the creature chooses which spell slots to lose), and Ẍ̷̫́ž̴̛͙̠̘ỳ̵̗̓͠t̷͈͔͌̈́ĥ̸̻̮͐ḯ̵̤͈̹͓ơ̸̞̱͒̊͘ͅr̴̨̗̽̽͜ regains hit points equal to ten times the level of the spells lost.