The Elder Scrolls IV: Shivering Isles

Overview
The expansion pack takes place in the "Realm of Madness", also known as the Shivering Isles, a realm of Oblivion ruled by the daedric prince Sheogorath. The realm is divided into two sections: Mania, which is bright, colorful and over-saturated, and Dementia, which is dark, depressing and claustrophobic. Near the eastern shore of the Shivering Isles lies the capital and only city of New Sheoth. One third of the city (Bliss) looks like and represents Mania. Another third (Crucible) looks like and represents Dementia. The final third is divided into half of both and is known as the Palace District. The Isles are threatened by an event called the "Greymarch" which happens at the end of each era and a champion must save them from possible destruction at the behest of Sheogorath.

The Realm of Madness is considerably different in both look and feel than anything in the land of Cyrodiil. Lead designer Mark Nelson stated that the reason for the drastic change in theme was because "People want to explore a new realm. Besides if you've played Oblivion for 200 hours, you've gotta be sick of gray stone castles." The new expansion pack has been estimated to have an additional 30-40 hours of gameplay available to players, and the Realm of Madness is said to be 25% of the size of Cyrodiil. There are 32 unique ingredients to the expansion, 10 new achievements, 10 new creatures (with different leveled versions), 9,500 new lines of dialog, 200 new weapons and 80 pieces of armor and clothing.

On entering the Shivering Isles the player is limited to an area called the "Fringe". The fringe is a small area which acts as a portal from the mainland of the Shivering Isles. To enter the realm itself a massive guardian called the Gatekeeper must be defeated. Defeating the Gatekeeper may be a challenge as he has very high defense and attack power. The player can choose to team up with an NPC who is an archer to help defeat the Gatekeeper although this is not mandatory. As the Gatekeeper protects Sheogorath's realm from unwanted attacks the player must construct a new one to replace the one he or she defeated during a later quest. The new enemies include two types of mages (Heretics,Zealots and Apostles), a large insect that utilizes a variety of poisonous attacks (The Elytra), a tree-like humanoid (The Gnarl), a primitive frog-like species that is much like the goblins in Cyrodiil (Grummites), and their supposed larval form (Balliwogs). The Dark Seducers and Golden Saints are returning from previous installments in the series as the protectors of Dementia and Mania, respectively. Golden Saints are skilled in blunt, combat, and Heavy Armor; while the Dark Seducers are more skilled in blade, magicka, and Light Armor. Another Daedric creature making its comeback is the Hunger. There are new spells that include the ability to summon Sheogorath's personal servant, Haskill, and a creature returning from Daggerfall, Flesh Atronach. Using materials found on the Isles called "Madness Ores"(Easily found with Grummites or in their lairs; used to make heavy armor with high armor ratings) or "Amber Ore" (Easily found with Gnarls or in their lairs; used to make light armor with lower armor ratings than the Madness equivalent) and templates for armor called "Matrices" (Matrix), new types of armor can be forged. Either normal armor can be forged using the Madness Ore or Amber alone, or these can be combined with the appropriate Matrices to form the same armor piece with added magical properties.

The player can also choose to side with either the Golden Saints or the Dark Seducers and become the duke/duchess of either Mania or Dementia during the main quest. To achieve the 250 gamer points for attaining both ranks the player will either be required to play through the Shivering Isles main plot line twice with different characters, or save the game prior to the moment the critical choice is made and play through this section of the plot line twice.

It is revealed during the course of the main quest that Sheogorath is actually Jyggalag, the Daedric Prince of Order that was cursed by the other princes to become the Prince of Madness, and he may only show his true form at the end of each era, during the "Greymarch." At the end of the main quest, the player fights and defeats Jyggalag, and is then proclaimed the new Prince of Madness, although Sheogorath tells you earlier that you can not become a daedric prince. The player receives several new powers including the ability to freeze a battle with Sheogorath's staff, to change the weather in the Shivering Isles which provides random stat boosts and a protect spell which teleports the player to safety and healing in Sheogorath's castle when they are near death. These abilities can only be used within the Isles. You also have the opportunity to call for a dancer, have a Golden Saint or Dark Seducer royal guard escort you and have access to an unlimited supply of combat-based mini-quests that involve defending the Gates of Madness or any of the towns from intruders or wild creatures respectively. You can choose to perform these quests either by sending your guards (500 gold reward) or by taking care of it yourself (1,000 gold). As an end game reward, you are given a set of Sheogorath's powerful enchanted clothing, and Jyggalag's sword, which functions as an unenchanted claymore in the player's hands.