Varuna

Sanjaya said, "Beholding Bhimasena overwhelmed by that weapon, Dhananjaya, for baffling its energy,
covered him with the Varuna weapon. In consequence of the lightness of Arjuna's arms, and owing also
to the fiery force that shrouded Bhima, none could see that the latter had been covered with the Varuna
weapon. Shrouded with the weapon of Drona's son, Bhima, his steeds, driver, and car became incapable
of being gazed at, like a fire of blazing flame in the midst of another fire. A

Drona Parva: Section 201