Narayana Astra

Then Drona's son, aiming at the host of the
Pandavas and the Panchalas, invoked the weapon called Narayana. Then thousands of arrows with
blazing mouths appeared in the welkin, resembling snakes of fiery mouths, that continued to agitate the
Pandavas. In that dreadful battle, those shafts, O king, like the very rays of the sun in a moment shrouded all the points of the compass, the welkin, and the troops. Innumerable iron balls also, O king, then appeared, like resplendent luminaries in the clear firmament. Sataghnis, some equipped with four and some with two wheels, and innumerable maces, and discs, with edges sharp as razor and resplendent like the sun, also appeared there.

Beholding the welkin densely shrouded with those weapons, O bull of
Bharata's race, the Pandavas, the Panchalas, and the Srinjayas, became exceedingly agitated. In all those
places, O ruler of men, where the great car-warriors of the Pandavas contended in battle, that weapon
became exceedingly powerful. Slaughtered by the Narayana weapon, as if consumed by a conflagration,
the Pandava troops were exceedingly afflicted all over the field in that battle. Indeed, O lord, as fire
consumeth a heap of dry grass in summer, even so did that weapon consume the army of the Pandus.
Beholding that weapon filling every side, seeing his own troops destroyed in large numbers, king Yudhishthira the just, O lord, became inspired with great fright.

Drona Parva Section CC