From the back of the book: "No Humans Allowed introduces the XXVc role-player to the exciting and the frightening, the common and the rare. Gennies, no matter what purpose they serve, await the XXVc player. No Humans Allowed includes: - Over 50 genetically altered human and nonhuman genotypes to populate your XXVc game universe. - Rules for creating your own gennie races. - Locations of the largest and most notorious gennie manufacturing plants in the solar system. - Rules for using your human gennies as Player Characters. - All the gennies and rules within this book are compatible with the AD&D 2nd Edition Game!"