Source: 1UP
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With a string of popular packs, Oblivion set the early example for what can be done with console downloadable content. A diverse collection that covered everything from Horse Armor to the completely integrated quest series in the Knights of the Nine kept fans happily adventuring in the realm of Cyrodiil. But for an expansion pack, developer Bethesda Softworks wanted to step out of the "more of the same" mold and go beyond just adding to its traditional fantasy world of stone castles and verdant forests. Just getting to the new Shivering Isles rips you completely out of the mundane domain of Cyrodiil, to be deposited in Sheogorath, the plane of the Daedric Prince of Madness.