Having regard to his (Indrajit's) energy and might, I shall relate to you the history of his race, in the light of which you will perceive why Rāvana's son had been capable of slaying his enemies, but could not himself be slain by them.
शृणु राम तथा वृत्तं तस्य तेजोबलं महत्। जघान शत्रून्येनासौ न च वध्यः स शत्रुभिः॥