Expansion features more than 30 hours of new gameplay and allows you to explore an entirely new plane of Oblivion - the realm of Sheogorath, the Daedric Prince of Madness. Shivering Isles adds to the existing world of Oblivion so you can continue playing with your existing save game/character, or create an all new character just to explore the new content.

Within the Realm of Sheogorath, players can explore the two extreme sides of the god's madness - the sublimely creative and the completely psychotic. Something is happening to the Shivering Isles and Sheogorath himself looks to you to be his champion and defend his realm and its inhabitants from destruction.

The Shivering Isles features a bizarre landscape split between the two sides - Mania and Dementia - filled with vast, twisting dungeons mirroring the roots of the trees they are buried within.

Shivering Isles is also available today on Xbox 360 video game and entertainment system from Microsoft via Xbox Live online entertainment network.