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In page Faction (Planescape):

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Also known as "the Dead", they believe that both life and death are false states of existence, that there is a state of True Death which can only be accomplished by denying one's emotions and physical wants and needs (a conception similar to eternal oblivion, but also conceivably to Nirvana). Their headquarters is the Mortuary, where Sigil's dead are interred or cremated. Their philosophy is closely related to that of Arthur Schopenhauer, along with some shared similarities with Buddhism, Stoicism and acosmism.