Magic Resistance. The alhoon has advantage on saving throws against spells and other magical effects.
Turn Resistance. The alhoon has advantage on saving throws against any effect that turns undead.
Innate Spellcasting (Psionics). The alhoon's innate spellcasting ability is Intelligence (spell save DC 16). It can innately cast the following spells, requiring no components:
At will: detect thoughts, levitate
1/day each: dominate monster, plane shift (self only)
Spellcasting. The alhoon is a 12th-level spellcaster. Its spellcasting ability is Intelligence (spell save DC 16, +8 to hit with spell attacks). The alhoon has the following wizard spells prepared:
Cantrips (at will): chill touch, dancing lights, mage hand, prestidigitation, shocking grasp
1st level (4 slots): detect magic, disguise self, magic missile, shield
2nd level (3 slots): invisibility, mirror image, scorching ray
3rd level (3 slots): counterspell, fly, lightning bolt
4th level (3 slots): confusion, Evard's black tentacles, phantasmal killer
5th level (2 slots): modify memory, wall of force
6th level (1 slot): disintegrate, globe of invulnerability
Chilling Grasp. Melee Spell Attack: +8 to hit, reach 5 ft., one target. Hit:10 (3d6) cold damage.
Mind Blast (Recharge 5–6). The alhoon magically emits psychic energy in a 60-foot cone. Each creature in that area must succeed on a DC 16 Intelligence saving throw or take 22 (4d8 + 4) 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.
Mind flayers that pursue arcane magic are exiled as deviants, and for them no eternal communion with an elder brain is possible. The road to lichdom offers a way to escape the permanency of death, but that path is long and solitary. Alhoons are mind flayers that use a shortcut.