the bound sword is a bound daedric claymore. that weapon is tied with the daedric warhammer.
You never become an actual god in Oblivion.
Its from the game Oblivion Oblivion Soundtrack - Auriel's Ascension is the song
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You should use something like wine to play Oblivion on a mac. You can find it very easy on google. That or just wait until Oblivion comes out for the Mac (if that ever happens).