Mbh 7.175.2e

On Ghatotkacha’s body there was not even two finger’s breadth of space that was not pierced with Karna’s shafts. Soon the Rakshasa seemed to be like a porcupine with quills erect on his body. So completely was he shrouded with shafts that we could not in that battle, any longer see either the steeds or the car or the standard of Ghatotkacha or Ghatotkacha himself. Destroying then by his own weapon, the celestial weapon of Karna, Ghatotkacha, endued with the power of illusion, began to fight with the Suta’s son, aided by his powers of illusion. Indeed, he began to fight with Karna, aided by his illusion and displaying the greatest activity. Showers of shafts fell from an invisible source from the welkin. Then Bhimasena’s son, endued with great prowess of illusion, O foremost of the Kurus, assumed a fierce form, aided by those powers, began to stupefy the Kauravas, O Bharata! The valiant Rakshasa, assuming many fierce and grim heads, began to devour the celestial weapons of the Suta’s son. Soon again, the gigantic Rakshasa, with a hundred wounds on his body seemed to lie cheerlessly, as if dead, on the field. The Kaurava bulls then, regarding Ghatotkacha deed, uttered loud shouts (of joy). Soon, however, he was seen on all sides, careering in new forms. Once more, he was seen to assume a prodigious form, with a hundred heads and a hundred stomachs, and looking like the Mainaka mountain.[235] Once again, becoming small about the measure of the thumb, he moved about transversely or soared aloft like the swelling surges of the sea. Tearing through the earth and rising on the surface, he dived again into the waters. Once seen here, he was next seen at a different place. Descending then from the welkin, he was seen standing, clad in mail, on a car decked with gold, having wandered through earth and sky and all the points of the compass, aided by his powers of illusion.