A copy of Codex of the Infinite Planes is suggested to help add background to the plane and the City of Brass, but it is not required to run the adventure. In addition, the default hook for the adventure involves the World Serpent Inn, a sprawling tavern occupying its own plane of existence. More details can be found in Infinite Doors of the World Serpent, including using the World Serpent Inn as a group patron. Both of these products can be found on the DMsGuild.
Monster statistics from sources outside the Monster Manual are listed with an asterisk (*) and reprinted in the adventure Appendix
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