Red-eyed dust bunny
The rationale was was clearly self-censorship, but this is one case where I liked the result: Evil priests, wizards, or warriors make great assassins; and the assassin class wasn't terribly interesting anyway.Assassins, the game claimed, were not a class because assassin was a profession, not an archetype. This was clearly nonsense, since the other classes could be thought of as professions too. The real reason they were dropped was to try to clean up the image of AD&D.
After you find a few, your forehead will start to look cluttered. IIRC, the original version trailed the owner, more like a cloak. They also didn't come in multiple colors.For the Ioun Stones, I never really liked the orbiting your head thing, it just seemed over the top or something. I would have preferred if I could just slap one into my forehead (like Moondragon, the Marvel character).