Editing Planescape (section)

===Factions===
{{Main|Faction (Planescape)}}
Within Sigil there are philosophy-derived factions. Before the event known as the ''Faction War'', the groups controlled the political climate of Sigil. Each of these factions is based on one particular belief system; one faction's beliefs make them enemies while others make them allies. There are fifteen factions in total.

====''The Faction War''====
{{Main|Faction War}}
In 1998, TSR published ''Faction War'', an adventure that effectively closed the book on Planescape, as it was then ending the product line. The culmination of several adventures leading up to that point, the Faction War brought an end to the factions' control of the city. Instigated by the power-hungry Duke Rowan Darkwood, factol of the Fated, in a bid to dethrone the Lady and rule Sigil himself, the war spread throughout the city before the Lady of Pain, with the aid of a group of adventurers (the players' characters), intervened.