The Elder Scrolls IV: Shivering Isles is the official expansion for Oblivion, the 2006 RPG and Game of the Year. It features more than 30 hours of new gameplay as you are sent to explore an entirely new plane of Oblivion -  the realm of Sheogorath, the Daedric Prince of Madness.

Source - www.2Kgames.com (publisher)

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Shivering Isles is the second expansion to be released for Elder Scrolls IV: Oblivion. The add-on features over 30 hours of extra game play and if that wasn't enough, a whole new realm to visit and explore. The realm is home to another Daedric Prince of Madness known as Sheogorath. There is no need to worry about compatibility as Shivering Isles can be used with existing saves.

This is what Todd Howard; the executive producer had to say about the release. “We’re thrilled with the response that Oblivion has received to date and feel that Shivering Isles will offer a whole new and different experience to anyone who played and enjoyed Oblivion,”

Within the realm of Sheogorath, players can explore the two extreme sides of the prince's madness. One being the sublimely creative and the other, well completely psychotic. Mania and Dementia give the Shivering Isles a bizarre landscape, filled with vast, twisting dungeons and new creatures including hideous insects, Flesh Atronachs, Skeletal Shambles; amphibious Grummites. Throughout your adventure, you will discover all new items, ingredients, spells, and more, and have the talented craftsmen of Crucible and Bliss forge new armour and weapons just for you.

Something is happening to the Shivering Isles and Sheogorath turns to you to be his champion and defend his realm from destruction. Do you have the strength to survive his trials, tame a realm fraught with paranoia and despair, and wear the mantle of a God?