Shivering Isles The Shivering Isles , also known as the Realm of Madness or The Madhouse , is a Plane of Oblivion belonging to the Daedric Prince Sheogorath . The realm consists of three parts : Mania , Dementia , and The Fringe . History . The Shivering Isles were once the realm of Jyggalag , the Daedric Prince of order . He was so powerful that the other Princes feared him . Because of it , they cursed Jyggalag to live a life of a madman , the thing that he hated most . Since then the Shivering Isles have been ruled by Sheogorath . However , every era Jyggalag is allowed to revert to his original form and wreak havoc in this realm of Oblivion . This event is known as the Greymarch , when Jyggalag destroys the Isles and turns them into the realm of perfect order . As a part of his curse after gaining control of the Shivering Isles , Jyggalag transforms back into Sheogorath who then recreates the realm back to one of madness . Haskill , who would later become Sheogorath ' s chamberlain , was said to have mantled Sheogorath in an event in a previous time . Sometime during the First Era , Sheogorath made a deal with the famed wizard Shalidor , giving him the Folium Discognitum for his work on Glamoril , in return for the island of Eyevea . Eyevea was later transported to the Shivering Isles , a decision which Shalidor would come to regret . In 2E 582 , the Vestige and Valaste of the Mages Guild succeeded in creating a corporeal form of Shalidor ' s soul . With his knowledge , Shalidor assisted the guild in surpassing Sheogorath ' s trials in the Shivering Isles , in the locations of Cheesemonger ' s Hollow , the Glade of the Divines , the Circus of Cheerful Slaughter , and the Chateau of Ravenous Rodent . After the trial , Sheogorath had Eyevea returned to Tamriel . During the year 3E 433 , Sheogorath sent an invitation to the Nirn in the form of a large three - headed gate to the Isles located in the Niben Bay . His purpose was to find a champion who would end the Graymarch . The person who would later become Sheogorath ' s champion would be none other than the Hero of Kvatch , who would kill the Gatekeeper , become the Duke or Duchess of either Mania or Dementia and defeat Jyggalag ' s Forces of Order while defeating the Daedric Prince himself in single combat , thus freeing him from his curse and allowing him to roam the plains of Oblivion in his true form . After being defeated , Jyggalag named the Hero of Kvatch the new Daedric Prince of Madness before departing to wander the voids of oblivion . During the Fourth era , Sheogorath went on a " vacation " to the mind of Pelagius Septim III . During this time , dialogue with Dervenin suggests that the Isles went into a state of chaos without the Mad God ' s rulership , as according to Dervenin the Cold Flame of Agnon went dark and that north and south raged war , suggesting a civil war took place . This was not until the Last Dragonborn , at the urging of Dervenin , went into the mind of Pelagius Septim III and made the Daedric Prince return to the Isles in 4E 201 . Flora and fauna . The Flora and Fauna of the Shivering Isles are a testament to Sheogorath ' s madness , as the north , known as Mania , reflects the Mad God ' s pleasure with simple madness and calm obsession . Mania features tall mushroom - like plants and colorful trees , and its fauna reflects these traits as creatures native to Mania are known to have more colorful bodies . The south , known as Dementia , reflects the darker side of Sheogorath ' s personality , featuring swamps , bogs and dark forests . All of the plant life of the Shivering Isles are connected to the root system , a series of natural caverns and rock formations that is , in fact , a large living organism that is connected to all of the trees and plants in the Isles . The Fauna of the Shivering Isles include many diverse creatures , including the tree - like Gnarl , the amphibious Baliwog and Scalon , the goblin - like Grummite , the insect - like Elytra , the canine Skinned Hound , the undead Shambles , the Daedric Golden Saint and their rivals the Dark Seducer , the Hunger and the Flesh Atronach . Getting to the Shivering Isles . Arrival to the Shivering Isles is solely at the discretion of Lord Sheogorath , Prince of Madness . He permits the Hero access after killing an insane dark elf that comes out of the portal to the isles . Once they kill him , they can enter the portal . Religion . The main religion in the Isles is obviously the worship of Sheogorath himself , as many , if not all , houses in the Isles include a small bust of the Mad God , as well as lettuce and string , the favorite playthings of the Mad God . There are also different opinions on Sheogorath ' s worship , and the role of the prophet Arden Sul . The Zealot cult believes that Sheogorath is a living god , and Arden Sul was his mortal aspect . While the Heretic cult believes that Sheogorath is in fact a powerful mortal man pretending to be a Daedric Prince who profanes the teachings of Arden Sul . There is also the Apostle cult , which believes that the Mad God is unfit to rule the Shivering Isles after their leader Ciirta discovered during last Greymarch that Sheogorath " left " the Isles ( while in fact he turned into Jyggalag ) . Ciirta and her apostles launched a movement to usurp the Mad God out of the Howling Halls that once kept the mad Emperor Pelagius III . Another part of the religion of the Isles is the worship of the prophet Arden Sul , as both Mania and Dementia have different stories of his death .