Ulitharid (The Black Pits II)

In the fifth arena battle of the third tier, a group of gladiators consisting of three Mind Flayers, a Thrall Wizard, a Thrall Archer and two Thrall Fighters has to be defeated. They are overseen by a single ulitharid that's protected by a special Minor Globe of Invulnerability. The ulitharid has many resistances and immunities and can be regarded as invulnerable, but it also doesn't engage in the fight. When the battle's over it will vanish from life and the plane with a last Psionic Blast.