The set consists of a Player and DM Guide, a Monstrous Supplement, a guide to the town of Sigil and the Outlands, four color maps, and a DM screen.
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Scott Haring reviewed the Planescape Campaign Setting for Pyramid #8 (July/August 1994).
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Sigil is centered in the Outlands, a stable area also known as Concordant Opposition, and contains doorways leading to every locale in the multiverse.
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