Magic Resistance. The ulitharid has advantage on saving throws against spells and other magical effects.

Innate Spellcasting (Psionics). The ulitharid’s innate spellcasting ability is Intelligence (spell save DC 17). It can innately cast the following spells, requiring no components:

At will: detect thoughts, levitate

1/day each: confusion, dominate monster, eyebite, feeblemind, mass suggestion, plane shift (self only), project image, scrying, telekinesis

Tentacles. Melee Weapon Attack: +9 to hit, reach 10 ft., one creature. Hit: 27 (4d10 + 5) psychic damage. If the target is Large or smaller, it is grappled (escape DC 14) and must succeed on a DC 17 Intelligence saving throw or be stunned until this grapple ends.

Extract Brain. Melee Weapon Attack: +9 to hit, reach 5 ft., one incapacitated humanoid grappled by the ulitharid. Hit: 55 (10d10) piercing damage. If this damage reduces the target to 0 hit points, the ulitharid kills the target by extracting and devouring its brain.

Mind Blast (Recharge 5–6). The ulitharid magically emits psychic energy in a 60-foot cone. Each creature in that area must succeed on a DC 17 Intelligence saving throw or take 31 (4d12 + 5) psychic damage and be stunned for 1 minute. A target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.

Chilling Grasp. Melee Spell Attack: +8 to hit, reach 5 ft., one target. Hit: 10 (3d6) cold damage.