When fighting the Balor, I am using the Orb of Golden Death to summon various creatures. None of them fight the Balor, however. They just stand there. Is this a bug?
Perhaps they were affected by his fear effect and tried to flee combat? If summoned by the Orb of Golden Death, it's possible that the summons are the same faction as the Balor, thus causing them to not see the Balor as an enemy. The Orb is an Evil item that may "seem beneficial" to the palayers, while secretly seeking to cause the downfall of it's new "owners".