Planar Devourer.

Vhizarnoth can bend the fabric of reality, causing effects that mirror the collision of planes. As a bonus action, it can choose one of the following effects (recharges after a long rest):

• Planar Rift: Summon a rift to another plane within 60 ft. of Vhizarnoth. Each creature within 30 ft. of the rift must succeed on a DC 23 Strength saving throw or be pulled 30 feet toward the rift and take 35 (10d6) force damage. The rift lasts for 1 minute or until dispelled.
• Reality Twist: Vhizarnoth creates an area of twisted reality in a 60-foot-radius sphere cantered on a point it can see within 120 feet. The area becomes difficult terrain, and any creature within the area must make a DC 23 Wisdom saving throw or become disoriented, suffering disadvantage on attack rolls, ability checks, and saving throws for 1 minute.

 Multiattack.

Vhizarnoth makes three attacks: one with its tendrils, one with its bite, and one with its planar strike.

Tendrils.

Melee Weapon Attack: +15 to hit, reach 30 ft., one target.

Hit: 26 (4d8 + 7) bludgeoning damage, and the target is grappled (escape DC 23). Until this grapple ends, the target is restrained, and Vhizarnoth can’t use its tendrils on another target.

Bite.

Melee Weapon Attack: +15 to hit, reach 5 ft., one target.

Hit: 36 (6d10 + 7) piercing damage plus 21 (6d6) necrotic damage. The target must succeed on a DC 23 Constitution saving throw or its hit point maximum is reduced by an amount equal to the necrotic damage taken. This reduction lasts until the creature finishes a long rest.

Planar Strike.

Ranged Spell Attack: +16 to hit, range 120 ft., one target.

Hit: 32 (6d10) force damage. If the target is a creature, it must succeed on a DC 23 Intelligence saving throw or be stunned for 1 minute. The target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.

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Legendary Resistance (3/Day).

If Vhizarnoth fails a saving throw, it can choose to succeed instead.

Innate Spellcasting.

Vhizarnoth’s innate spellcasting ability is Charisma (spell save DC 25). It can innately cast the following spells, requiring no material components:

• At will: Dispel Magic, Plane Shift, Teleport, Wall of Force
• 3/day: Time Stop, Reality Break (Xanathar's Guide), Maze
• 1/day: Wish

Psychic Siphon.

As a bonus action, Vhizarnoth can target one creature within 60 feet and drain its psychic energy. The target must succeed on a DC 23 Intelligence saving throw or take 36 (8d8) psychic damage and be stunned until the end of its next turn. Vhizarnoth regains hit points equal to the psychic damage dealt.

Frightful Presence.

Each creature of Vhizarnoth’s choice within 120 feet and aware of it must succeed on a DC 23 Wisdom saving throw or be frightened for 1 minute. A creature can repeat the saving throw at the end of each of its turns, with disadvantage if Vhizarnoth is within line of sight, ending the effect on itself on a success.

Legendary Actions (3/Turn)

Teleport.

Vhizarnoth magically teleports, along with any creatures it is grappling, up to 120 feet to an unoccupied space it can see.

Reality Warp (Costs 2 Actions).

Vhizarnoth twists the fabric of reality within 60 feet of itself. Each creature in the area must succeed on a DC 23 Dexterity saving throw or take 28 (8d6) force damage and be knocked prone.

Corruptive Touch (Costs 3 Actions).

Vhizarnoth touches a creature within 5 feet of it. The target must succeed on a DC 23 Constitution saving throw or be cursed. While cursed, the target takes 21 (6d6) necrotic damage at the start of each of its turns. The curse lasts until removed by a remove curse spell or similar magic.