The Outer Planes surround the Inner Planes and are permeated by the Astral Plane. These are the homes of such immortals as deities and fiends. They are arranged according to alignment, with Lawful Good being the polar opposite of Chaotic Evil. Some of the Outer Planes mentioned in Planescape: Torment include Mechanus, Celestia, Baator and the Abyss. More can be learned here.
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