From hundred and eight historic sciences, there are nonetheless some sciences about which widespread folks have no idea anything. Such one of many science which had remained well-known was combat science (युद्ध विज्ञान). Under this class of the science educating was given to the individual by growing one’s energy and skill for self and different's protection. With that teachings associated to weapons had been even be used to given which act as helper in energy development. Under this science it had additionally been used to taught that easy methods to use vitality which is there in land and air to generate energy and fight. This was the science which spread during Buddha period with which new improvements befell and numerous information of martial art came in contact with totally different countries. With this, we get concept that our historic sages should have special information of bio and physic sciences. When this science was merged with tantra side then numerous processes came to know which were meant to win the fights. Many sadhna got here in ront like Seinya Stambhan, Seinya Maaran, Raajya Mohini, Raja Vashikaran etc. with these, most necessary processes which got here ahead had been astr sadhna. in our scriptures it is talked about that in combat numerous astra were introduced to make use of, we discover point out of assorted astra like agni, paavakaa, varun, naag, aghor, bramha etc. all these astra could be acquire with sadhna at present even. To perform sadhna of various god goddess and to achieve astra from them such incidents are present in our scriptures. This fashion sudarshan chakra belongs to god Vishnu. Astra associated sadhna are very exhausting and rigorous and should take a number of years for sadhak. However there are small ritual too exists associated to those astra. By undertaking which god and goddess ship their astra to sadhna for his or her safety being pleased. However such rare processes are exhausting to get, somewhere mantra might be found mentioned but processes are arduous to find. Sadgurudev have given info about such processes to ascetic disciples.