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Official Site: Bethesda Softworks

The Elder Scrolls IV: Shivering Isles is the largest official expansion pack for the role-playing game The Elder Scrolls IV: Oblivion. Announced on January 18, , the expansion was developed, published, and released over the Xbox Live Marketplace by Bethesda Softworks; its retail release was co-published with 2K Games. It was released for Microsoft Windows in a boxed retail edition on March 27, 2007, while the Xbox 360 version was released digitally on the Xbox Live Marketplace. Shivering Isles takes place on the eponymous isles ruled by the Daedric Prince of Madness, Sheogorath. The player becomes Sheogorath's protégé, and together they try to defeat the Daedric Lord of Order, Jyggalag, thus preventing the isles from being destroyed.

Shivering Isles changes none of the basic gameplay of Oblivion; the basic design, maneuvers, and interfaces remain unchanged. Enemies increase in difficulty as players strengthen their skills, scaling the game's challenge to the players' strength.

As with the original game, The Shivering Isles is an example of open-ended or sandbox-style gameplay. The main quest may be delayed or completely ignored as the player explores the game world, follows side quests, interacts with non-player character, and develops a character according to their taste. Once the game is updated the player can access the extra content at any time with any character.

The expansion pack takes place on the Shivering Isles, ruled by the Daedric Prince of Madness, Sheogorath. The realm is divided into two sections, Mania and Dementia, both of which have different characteristics in the art and design. The player enters the realm as an event called the Greymarch, in which the Daedric Prince of Order, Jyggalag, completely destroys the Shivering Isles, is about to occur. Upon entering the realm, the player has access to only one area of the Shivering Isles, called the Fringe. To gain access to the other areas, the player must defeat a creature called the Gatekeeper. Before entering the other areas, the player is summoned for an audience with Sheogorath. Sheogorath explains to the player that the Greymarch will destroy the realm, and Sheogorath needs a "champion" to stop the event from occurring. Sheogorath decides to choose the player as his protégé, whom he sends off on various quests in an attempt to stop the Greymarch.

Sheogorath has not been a contender in any CBUB matches.