Liber Pennae Praenumbra is a text by American occultist Nema Andahadna who said that she channeled the text in 1974 while in meditation. The result was a work imbued with poetic and cryptic language, filled with references to cosmic justice, personal enlightenment, and the magical formula IPSOS. This work is significant within certain esoteric circles, particularly those influenced by Thelema and the Maatian tradition.