Magic Resistance: The mind flayer has advantage on saving throws against spells and other magical effects
Innate Spel/casting (Psionics): The mind flayer's innate spellcasting ability is Intelligence (spell save DC 15). It can innately cast the following spells requiring no components:
At will: detect thoughts levitate
1/day each: dominate monster plane shift (self only)
Tentacles: Melee Weapon Attack: +7 to hit reach 5 ft one creature. Hit: 15 (2d10 + 4) psychic damage. If the target is Medium or smaller it is grappled (escape DC 15) and must succeed on a DC 15 Intelligence saving throw or be stunned until this grapple ends
Extract Brain: Melee Weapon Attack: +7 to hit reach 5 ft
one incapacitated humanoid grappled by the mind flayer. Hit: The target takes 55 (10d10) piercing damage. If this damage reduces the target to 0 hit points the mind flayer kills the target by extracting and devouring its brain
Mind Blast (Recharge 5-6): The mind flayer magically emits psychic energy in a 60-foot cone. Each creature in that area must succeed on a DC 15 Intelligence saving throw or take 22 (4d8 + 4) 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