Well, personally i doubt that anyone could kill Mannimarco (or do anything with him) the guy was the most powerfull mage that ever lived (and lived a longe time), then he just die for a random person on a guild battle? I can't be the only one, really, i'm sure that Mannimarco will be back from Oblivion. Maybe that's not too lore friendly but i would like a NPC mod to a Mannimarco quest line, what i imagine is like this: 1- Right after the Dragonborn find the Necromancer's Amulet the Mannimarco spirit talks to him, like on the College quest when the Psijic Order talk to him. He says that he's comming back, and then you can choose to serve Mannimarco OR go against him. 2- He wants to take back all artifacts that he lost. 3- He wants to create a new guild (the dragonborn could bring followers to him if he chooses to serve him). 4- He wants a ravenge against the Mage Guild. (could be a great final battle on the end of the quest line) I hope you guys can understand, my english is really poor but that's the idea :)