In all the Tantra based books, we find description of different Shadhnas (practices), which a person can practice to know past, present and future. Among all, Kalgyan Aur Karn Pishachini Sadhna is the most popular. According to the details given in Hindu Shashtras, Karn Pishachini is another power of goddess Durga. Once completing the Sadhna of Karnpishachini, the performer feels and sees several miracles which he / she can not even imagine. The book contains the complete details of this practice and explains it step by step.
