From publisher blurb: The Chymist is an adaption of the 3.75 Alchemist to older (OSR) editions of the game. Unlike the traditional old school alchemist, the chymist throws bombs, picks locks and find traps, creates spell-like magical potions called extracts, and oh, transforms into a Mr. Hyde type figure. Although primarily intended for the 1st advanced edition of the worlds first fantasy role-playing game, tables are included for the original and expert editions.