Another brave warrior in the army of the Kauravas, he shared his name with an elephant. He had acquired the most effective 'Astra' or weapon. Known as Brahmastra, the astra never failed. When it was aimed at a particular person that person was sure to die. In the battle he used it to kill Ghatotkach. Who are we referring to?

Ashwathama is the correct answer. He was the son of Dronacharya and a powerful warrior who possessed the Brahmastra, an invincible divine weapon. During the battle, when Ghatotkach was decimating the Kaurava forces, Ashwathama used the Brahmastra to kill him. The other options are not the Kaurava warrior associated with the Brahmastra.