The Encyclopedia of Impossible Things includes:
*More than 400 new cyphers.
*More than 250 new artifacts.
*Scores of artifacts made famous by the mythology and fiction that gave life to their recursions, plus dozens of emergent artifacts that were created or evolved within the Shoals of Earth or the Strange itself.
*Rules for personal recursions for player characters, including a sheet you can use to design and maintain your very own recursion.
160-page hardcover by Bruce R. Cordell