This mauve colored human-shaped creature has an octopus-like head with four lashing tentacles. It is clad in ornate, heavy armor and wields a flail.

Next to the Thoon elder brain, Thoon disciples have the closest connection with the mysterious presence called Thoon. Devoted to whatever principles they think Thoon supports, these clerics provide healing and divine magic to other mind flayers of Thoon. Unlike shadow flayers, Thoon disciples are normal mind flayers.

Thoon disciples can heal their allies and hold their own in melee combat. These abilities make them versatile additions to encounters with the mind flayers of Thoon. Thoon disciples are particularly challenging when they have a few rounds to prepare by casting protective and enhancing spells before the battle begins. They have more than twice as many hit points as a standard mind flayer and much better armor, so they’re far more durable.

Although a Thoon disciple can be effective as a melee combatant, it’s equally deadly in the back ranks of a mind flayer force. A Thoon disciple has a potent mind blast, and it can often keep a hold person spell going long enough for another mind flayer to perform a brain extraction.

A Thoon disciple regards itself as second only to the Thoon elder brain among the followers of Thoon. Since the elder brain agrees with this assessment, Thoon disciples handle the day-to-day leadership chores that the Thoon elder brain can’t do itself. Because the Thoon disciples manage the shadow flayer breeding program, they eagerly use suggestion and charm monster to make shadow flayers perform errands for them. Many Thoon disciples are secretly pleased that the shadow flayers have diminished psionic ability—it makes the shadow flayers more pliable.