The player is recruited by Sheogorath to stop an apocalyptic event called the Graymarch. Like his insanity, the Palace teeters on the edge of both sides. Sheogorath watches over his lands from his palace in the capital city of New Sheoth, which like the rest of the Isles is divided into the dark Crucible and light Bliss.
The realm reflects Sheogorath's madness, being split down the middle between the bright and beautiful Mania, and the dark and blighted Dementia. The expansion takes place in the titular Isles, which is the realm ruled over by the Madgod Sheogorath. The Shivering Isles is the second full expansion released for The Elder Scrolls IV: Oblivion, the first being Knights of the Nine.
