This second revised edition of Crowley's magnum opus features new, more legible typesetting, text corrections based on a previously unseen corrected proof, and the previously unpublished Liber Testis Testitudinis.The original Book of the Law was rescanned for this edition, using the latest technology, for the clearest facsimile possible. Edited, annotated, and introduced by Frater Hymenaeus Beta, XI.