The Pashupatastra (IAST: Pāśupatāstra, sanskrit: पाशुपतास्त्र), in Hindu History, is an irresistible and most destructive personal weapon of Shiva, Kali and Adi Para Sakthi discharged by the mind, the eyes, words, or a bow. Never to be used against lesser enemies or by lesser warriors, the Pashupatastra is capable of destroying creation and vanquishing all beings. Pashupatastra is the most destructive, powerful, irresistible weapon of all the weapons mentioned in the Hindu mythology.
In the Mahabharata war Arjuna obtained this weapon from Lord Shiva.
A Narrative from Kisari Mohan Ganguli translation of Mahabharat regarding the power of Pashupatastra:
O thou of mighty arms, that weapon (Pashupatastra) is superior to the Brahma, the Narayana, the Indra, the Agneya, and the Varuna weapons. Verily, it is capable of neutralizing every other weapon in the universe. It was with that weapon that the illustrious Mahadeva had in days of yore, burnt and consumed in a moment the triple city of the Asuras. With the greatest ease, Mahadeva, using that single arrow, achieved that feat. That weapon, shot by Mahadeva's arms, can, without doubt consume in half the time taken up by a twinkling of the eyes the entire universe with all its mobile and immobile creatures. In the universe there is no being including even the deities, that are incapable of being slain by that weapon.
Another Narrative from [[Kisari Mohan Ganguli]] translation of ''Mahabharat'' regarding the Pashupatastra:
Mahadeva said to arjuna:-↵
'O powerful one. I will give to thee that favourite weapon of mine called the ''Pasuputa''. O son of Pandu, thou art capable of holding, hurling, and withdrawing it. Neither the chief himself of the gods, nor Yama, nor the king of the Yakshas, nor Varuna, nor Vayu, knoweth it. How could men know anything of it? But, O son of Pritha, this weapon should not be hurled without adequate cause; for if hurled at any foe of little might it may destroy the whole universe. In the three worlds with all their mobile and immobile creatures, there is none who is incapable of being slain by this weapon. And it may be hurled by the mind, by the eye, by words, and by the bow.'"
Agni Puran chapters 317 to 326