From the introduction: The Thrash Sourcebook is a general-purpose supplement for Thrash, with a bit of information on just about everything. Herein you will find a selection of general game material, plus information on Weird Powers, high tech stuff, and the many styles of kung fu. This is all the result of a many hours of research and even more of brainstorming, and still more of actual writing; hopefully, it will vastly expand the game's repertoire of options for characters and other stuff, and generally has lots of nifty stuff in it.