The Rifts Game Master Guideis a massive, 352 page reference book with short stats and descriptions for every Rifts robot, power armor, body armor, vehicle, weapon, gadget, skill, experience table, and map that appears inRifts World Books 1-23andSourcebooks 1-4, plus a bionics index, an O.C.C. and R.C.C. index, rules clarifications, combat examples, advice on how to run a game and more.