The Book of the Law (法の書 Hō no sho?) also known as Liber AL vel Legis (リバー・アル・ベル・レギズ Liber AL vel Legis?) is the central sacred text of Thelema, a grimoire written by Aleister Crowley, the greatest magician in history, the contents of which came from being known as Aiwass. Indecipherable, the contents of the book, if ever deciphered, could spell the end of the Religion of the Cross, Christianity.