It's been available as a download via the Xbox live marketplace for some time, but Bethseda has now announced that The Elder Scrolls IV: Shivering Isles, the expansion for The Elder Scrolls IV: Oblivion for Xbox 360 will be available in shops in October. The retail disc will also include the downloadable content, The Elder Scrolls IV: Knights of the Nine.

With more than 30 hours of new gameplay, Shivering Isles allows you to explore an entirely new plane of Oblivion – the realm of Sheogorath, the Daedric Prince of Madness. 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. Sheogorath himself looks to you to be his champion and defend his realm and its inhabitants from destruction as you discover all new items, ingredients, spells, and much more.

Knights of the Nine features an all-new faction and quests for noble characters and answers many of the questions surrounding the Ayleid ruins found throughout Oblivion. Players can join a new faction and found their own order of holy knights – leading them into battle against a sorcerer-king and his demonic minions while exploring massive dungeons and searching for legendary relics – the holy armor and weapons of the Divine Crusader.