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It is sometimes known as the Brahma Astra (Astra means 'weapon'). As described in a number of the Puranas, it was considered the deadliest weapon. It was said that when the Brahmastra was discharged, there was neither a counter attack nor a defense that could stop it, except by Brahmadanda, a stick also created by Brahma. The Brahmastra never missed its mark and had to be used with very specific intent against an individual enemy or army, as the target would face complete annihilation. It was believed to be obtained by meditating on the Lord Brahma; it could only be used once in a lifetime. The user would have to display immense amounts of mental concentration. According to ancient Sanskrit writings, the Brahmastra is invoked by a key phrase or invocation that is bestowed upon the user when given this weapon. Through this invocation the user can call upon the weapon and use it via a medium against his adversary.
Since Brahma is considered the Creator in Sanatana Dharma, it is believed by Hindus that Brahmastra was created by him for the purpose of upholding Dharma and Satya, to be used by anyone who wished to destroy an enemy who would also happen to be a part of his (Brahma's) creation. The target, when hit by Brahmastra, would be utterly destroyed. Brahma had created a weapon even more powerful than the Brahmastra, called the Brahmashira. The Brahmashira was never used in war, as it had four times more power than the Brahmastra, i.e. Fourth power square, as the name suggests, since Brahma has Four Heads. Only Arjuna and Ashwatthama possessed the knowledge to summon the Brahmashira.
The weapon was also believed to cause severe environmental damage. The land where the weapon was used became barren and all life in and around that area ceased to exist, as both men and women became infertile. There was also a severe decrease in rainfall with the land developing cracks, like in a drought. There are various descriptions of weapons created by Hindu deities such as Agneyastra, Brahmastra, Garudastra, Kaumodaki, Narayanastra, Pashupatastra, Shiva Dhanush, Sudarshana Chakra, Trishul, Vaishnavastra, Varunastra, and Vayavastra; the personal weapons of the gods, the trishul, chakram and the brahmastra, are the most powerful.
There are numerous instances within Sanskrit scriptures where the Brahmastra is used or its use is threatened, including:
- Vishvamitra used it against Vasishta, but the Brahmastra was swallowed by Brahmadanda, Lord Brahma's countermeasure against the Brahmastra.
- In the Ramayana a Brahmastra is used by Shri Rama several times: once against Taranisen (Ravana's brother Bivishan's son), twice against Kumbhakarna to his right hand and head during their battle in Lanka. Lakshmana (Shri Rama's younger brother) used brahmastra against Atikaay (Brother of Ravana). Also, Indrajit used Brahmastra against Hanuman when he was destroying the Ashok Vatika after meeting Sita. Lakshmana also tried to use it with Indrajit in the same battle, but Rama stopped him from using the weapon saying, "his use of the Brahamastra was not justified, nor would it benefit mankind."
- It is also mentioned in vedas that Brahmastra was aimed by Shri Rama to make way out of sea so that the army of apes can march towards Lanka, however at the very moment, Varuna appeared and told Lord Rama, about the technical flaws of using the weapon and hence later was aimed towards Poorv Disha- East Direction by Lord Rama,which fell at the place of modern day Rajstan causing it to become a desert. Also Indrajit aimed a Bhramastra at Lord Lakshman on the final battle between him and Lord Lakshman, however the deadly weapon returned unharmed.
- Prior to the Epic war of the Mahabharata, Karna was planning to use the Brahmastra to fight Arjuna, but did not do so at the behest of Kunti
- The confrontation of Arjuna and Ashwatthama in Mahabharata, where Arjuna retracts his weapon as ordered, but Ashwatthama, unable to do so, instead sends it to attack Arjuna's unborn grandson, Parikshit, who is subsequently saved by Krishna. This was Brahma Sheer Astra. This confrontation is also said to have involved the four square more destructive weapon, the Brahmashira. In this version Ashwatthama did not have his bow and arrow near him when he was confronted by Arjuna. So he took a piece of straw and after silently invoking the proper phrase he threw the straw at Arjuna, which carried the power of the Brahmashiras. In response, Arjuna also invoked the Brahmashira to counter Ashwatthama's, but the collision of two Brahmashiras would have destroyed the universe, so Rishi Vyas came between the two Brahmashiras, preventing their collision. Arjuna called back his Brahmashira, but Aswathama did not know how to do this, so he commanded his weapon to attack the unborn grandchild of Arjuna (Parikshit).