The Elder Scrolls Online - Who Is Mannimarco?

thegamer.com:

Mannimarco, the King of Worms, is a scorned villain through Daggerfall, Oblivion, and even The Elder Scrolls Online—he's an intriguing figure, particularly with his ties to necromancy, and one of the more powerful TES characters. Due to Daggerfall's Dragon Break, which, to put it simply, made every single possible ending canon to the story, there are two Mannimarco's by the time of Oblivion. But long before that, he helped the Daedric Prince Molag Bal invade Tamriel. And by Oblivion, he himself had become a god.

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There's a lot of history tied to this one character, an Altmer who has been around since the first era, joining the Psijic Order and earning a reputation as one of the best students it ever produced. Fast forward, though, and he'd become a blight on Tamriel, a plague in its history.

Mannimarco first appeared in Daggerfall, where we're tasked with delivering a message to him. He's a lich-like figure with an obscured face, glowing blue eyes, and a red cloak. But despite appearing villainous, we can work for him, getting him the soul of Prince Karolis and helping him get his hands on the Totem of Tiber Septim. He uses this Totem to ascend to godhood, becoming the god of necromancy, but he also doesn't.

Daggerfall's Dragon Break means that every ending of the game happens simultaneously. In all but one of those endings, Mannimarco doesn't ascend to godhood. This means that he becomes the god of necromancy and leaves his mortal self behind, hence his appearance as the villain in Oblivion's Mage's Guild questline.

The Totem! At last it is within my grasp. You have done well. I shall remember this when I have transformed. Search now for the Mantella.