The first part of Planescape: Torment takes place in Sigil, a city located atop an infinitely tall spire at the center of the multiverse, that connects the planes with each other via a series of portals. The city is overseen by the powerful Lady of Pain, while fifteen factions control different functions of the city related to each group's world view. Every faction strives for further control of the city. Several of these factions can be joined by The Nameless One during the game. The story eventually moves on to other planes, such as Baator and Carceri, where The Nameless One continues to discover more about his past.