Nāgāstra in the Karṇa Parva

Nāgāstra means “serpent weapon”. In the Karṇa Parva of the Mahābhārata (Chapter 90), it names the episode in which the nāga (serpent being) Aśvasena entered the shaft of an arrow that Karṇa was about to shoot. Aśvasena wanted revenge on Arjuna for the death of his mother when the Khāṇḍava forest was burned. Filled with the nāga, the arrow became a serpent weapon and aimed itself at Arjuna’s head.

At the critical moment Kṛshṇa pressed down on the chariot with his foot, so that it sank a little into the earth. The arrow struck Arjuna’s kirīṭa, the divine crown given to him by Indra, and knocked it off instead of cutting off his head. Karṇa refused to shoot the same arrow a second time, and Arjuna then killed Aśvasena. This is one of the most dramatic moments in the final duel. It shows Kṛshṇa as Arjuna’s true protector, and it shows Karṇa keeping to the warrior’s code even when it cost him.

Aśvasena Enters the Arrow

Aśvasena was the son of Takshaka, the great king of the nāgas. When the Khāṇḍava forest was burned, with Arjuna and Kṛshṇa helping Agni, Aśvasena’s mother was killed in the fire. Aśvasena himself escaped by hiding inside his mother’s open mouth. From that day on he carried an undying hatred for Arjuna.

On the seventeenth day of the Kurukshetra war, as Karṇa was making his greatest effort against Arjuna, Aśvasena saw his chance. He entered, with his whole being, into the shaft of one of Karṇa’s arrows. He made himself the very substance of the arrow, so that once it was released, his own will would guide it to the target he wanted: Arjuna’s head.

Kṛshṇa Steps In

Karṇa drew his bow and aimed straight at Arjuna. The arrow, filled with the nāga, blazed with terrible power and flew straight for Arjuna’s neck and head. Everyone watching could see that its path meant certain death.

At that exact moment Kṛshṇa, standing as Arjuna’s sārathi (charioteer), pressed down with his foot on the frame of the chariot. The divine weight of Kṛshṇa’s foot made the great war chariot, drawn by the divine horses Śaibya, Sugrīva, Meghapushpa and Balāhaka, sink a little into the earth. The chariot went down by one hasta (a forearm’s length).

Because the chariot was now lower, the arrow, aimed at where Arjuna’s head had been, struck the kirīṭa instead. This was the splendid divine crown that Indra himself had given Arjuna, which he had worn throughout the war. The nāga-arrow hit the crown with full force and sent it spinning from Arjuna’s head into the dust of the battlefield.

Arjuna was alive. The crown was lost, but the arrow’s purpose had failed.

Karṇa Refuses to Shoot Again

After the arrow missed its mark, striking the crown and not the head, Aśvasena came back and appeared before Karṇa in the form of the arrow. He told Karṇa who he was and why he had entered the arrow. He urged him: “Shoot me again! This time the aim will be true and Arjuna will die!”

Karṇa refused. He said: “I will not shoot the same arrow twice. A great warrior shoots once. He does not rely on using his own weapon again against the same enemy at the same moment.” To shoot the same arrow twice at the same target broke the warrior’s code, and Karṇa would not do it, even though it meant losing the greatest chance of the day.

The Mahābhārata presents this faithfulness to the warrior’s code, at a moment of the greatest advantage, as one of the signs of Karṇa’s true warrior character. At the same time, the text also lists the ways in which he had strayed from dharma at other times.

Arjuna Kills Aśvasena

Turned away by Karṇa, Aśvasena did not leave. He took back his serpent form and moved toward Arjuna on his own, trying to attack him directly as a nāga. Arjuna answered at once. He shot six arrows and cut Aśvasena to pieces. The nāga who had lived through the Khāṇḍava fire and waited years for revenge was destroyed in moments by the very man he had tried to kill.

Arjuna’s Crown

The crown knocked from Arjuna’s head was the kirīṭa, the divine crown given by Indra to his son Arjuna. It was a sign of Arjuna’s divine parentage and his divine nature. Its loss at this moment, struck away by the nāga-arrow, was both a physical event and a symbolic one.

Why the Episode Matters

The Nāgāstra episode is an important turning point in the story of the final duel. It was Karṇa’s last real, near-certain chance to kill Arjuna, and that chance was defeated not by Arjuna’s own action but by Kṛshṇa stepping in. This underlines the Mahābhārata’s constant teaching about Arjuna and Kṛshṇa: Arjuna fights, and Kṛshṇa protects. The warrior’s skill is real, but the final protection comes from Bhagavān Kṛshṇa.

Karṇa’s refusal to use the arrow again also shows something of the sorrow of his character. He held to the warrior’s code at this moment, choosing honour over advantage, even while the outcome of the war hung in the balance.

Sources

• Mahābhārata, Karṇa Parva, Chapter 90