This comprehensive two-volume set by S.N. Khandelwal serves as a rare and exhaustive encyclopedia of secret Shabar Mantras, traditionally believed to be originated by Lord Shiva and propagated by Guru Gorakhnath. The first volume introduces the fundamental principles and Sadhana methods for various traditional Hindu mantras, while the second volume uniquely focuses on Islamic, Sikh, and Nath sect mantras, including diverse regional totkas (remedies). Written in Hindi with Sanskrit excerpts, these books provide practical instructions for using mantras to address day-to-day spiritual, physical, and worldly challenges with minimal ritualistic complexity. The set is highly regarded for its authentic compilation from rare sources, making it an essential resource for practitioners and researchers of Indian Tantra and folk spiritual traditions. Published by the renowned Chaukhamba Surbharati Prakashan, these hardcover volumes collectively span over 1,200 pages, offering a deep dive into the mystical heritage of rural and forest-dwelling spiritual lineages.