Factions, Sects, Religions, Guilds and Groups

Planescape is all about how belief has power. A good representation of that power can be seen with the belief of divine spellcasters in their gods, and the power they recieve for that belief.

Also, certain groups that hold a strong belief amongst all of its members can gain abilities based on that belief. And by acting in the interest of the group, and showing that your character believes strongly in the same idea as the group, through tasks and trials, it is possible to gain influence within the group, and rise through its ranks, gaining more power.

Because of this phenomenon, these organizations hold tremendous power on the planes. The biggest of these groups are called factions, followed by sects, guilds, and then small groups.