Eldritch Wizardry is a supplementary rulebook by Gary Gygax and Brian Blume, written for the original edition of the Dungeons & Dragons (D&D) fantasy role-playing game, and included a number of significant additions to the core game.
Eldritch Wizardry was written by Gary Gygax and Brian Blume and published by TSR in 1976 as a sixty-page digest-sized book, and was the third supplement to the original D&D rules. Eldritch Wizardry introduced psionics and the druid character class. The sixty page supplement added several other new concepts to the D&D game, including demons (and their lords Orcus and Demogorgon), psionics-using monsters (such as mind flayers), and artifacts (including the Rod of Seven Parts and the Axe of the Dwarvish Lords).