Also, Wasn't Manimarko supposed to be a sload, not an Altmer?!
No, he is an Atlmer. What you are thinking of is that the Sload idolize and worship Mannimarco as a god.
The storyline of the Oblivion Mages' Guild was just so terrible. Its funny that Traven kills himself to make the gem to protect you. I didn't pick it up and still demolished the so called "Mannimarco" (that's NOT the King of Worms I so know and love). Its just a shame that the powerful, intelligent, and very neutral King of Worms presented in Daggerfall turned into a generic, idiotic, girly-elf boy who gets one-shot in a magical fight.
The entire storyline, if one could even call it that, was so ridiculous. The guild gets attacked by necromancers, and suddenly, they're ALL bad guys who we run around and exterminate. Not only that, they only attacked because they were provoked in the first place! If someone really looks, the Mages Guild was the worse side in the conflict, but the writing tried to make it look the other way around (And failed badly).