I am nameless. I do not know who I am. I know only that I cannot die. I awoke on a slab in a vast mortuary, in the heart of the city of Sigil. The City of Doors. The center of all things, the core of the multiverse. Sigil is the gateway to every plane of existence. In one of those planes lies the secret of my identity. Of my immortality. The quest may lead to the gates of Hell itself -- or beyond.