According to scans of PC Zone magazine, Bethesda Softworks has been secretly making a full-length expansion to their hit title The Elder Scrolls IV: Oblivion. Shivering Isles will offer an additional 30 hours of gameplay including quests, monsters and additional free-form gameplay abilities that define the title, such as a new land "that you can watch change according to your vital life-or-death decisions."

As far as the story is concerned an unusual looking gate has opened in Nibben Bay, a gate that looks into the torn realm of the Shivering Isles, a land ruled by the god of madness and dementia, Sheogorath. Upon meeting the deity, players will be tasked with plowing "through his trials."

Shivering Isles is set for Q2 2007 release on the PC.