User blog comment:Jett Cyber/Tournament of Legends: Round 3/@comment-24.44.141.89-20131103175908

Magnus built Mundus on magic, which is why normal people are able to use it and tap into it. It's the universes power source. He also was able to retain his power when he tore a hole in the sky which we know as the sun unlike the rest of the Aedra who have their powers drained and their holes are just planets. Sorry, Molag.