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http://i1245.photobucket.com/albums/gg587/golgi7777/MD_zps0570f17c.jpg

vs

http://i1245.photobucket.com/albums/gg587/golgi7777/AE_zps6d522b6f.jpg

Archenemy was taking on every hell lord in creation and that was when they unified all their realms (basically all their powers combined at their peak). That's too much for Mageddon, even if we take into consideration his implied power.