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My group is playing using Pathfinder rules, but really want to transport themselves to Planescape's city of Sigil.
Regardless of D&D Edition or Campaign Setting, what source books are there that focus on Sigil that I should familiarize myself with so I can be ready to GM once they have managed to get there?
Please do make yourself familiar with the Planescape setting itself via Planescape Campaign Setting boxed set.
After you do, the book you want is In the Cage: A Guide to Sigil. You might also want to take a look at The Factol’s Manifesto.
I have recently found this full planescape index. From there you can look up references to Sigil, and locations within and cross reference the books.
Additionally, I found an interactive map of Sigil with useful book references there as well.
The Planar Handbook is a D&D 3.x splatbook that contains a small section on Sigil. (Pages 141 to 146 deal with it.)
The Manual of the Planes (p 147-152) also D&D 3.x concerns the Outlands. Sigil, also called the City of Doors, is located at the heart of the Outlands.
