Adbhut Mantra Sagar is a comprehensive tantric and mantra reference spanning five complete parts compiled into a single volume. Authored by Tantrik Bahel, the book presents a vast collection of sacred mantras, rituals, and spiritual practices drawn from traditional sources. It serves as a practical guide for spiritual practitioners seeking to understand and apply ancient mantra techniques for healing, protection, and empowerment. With roughly 900–1000+ pages in sturdy hardcover, it offers detailed explanations and applications of tantric methods and mantra uses. Published by Randheer Prakashan, Haridwar, the text is widely circulated among devotees and students of Tantra and spiritual mantras.