 अवध्यस्सर्वभूतानांगन्धर्वोरगरक्षसाम् ।राजपुत्रदशग्रीवोवरदानात्स्वयंभुवः ।। 
 "Oh Prince, by virtue of a boon granted by Brahma, the selfborn to the tenheaded Ravana, he cannot be killed by Gandharvas, Rakshasas and by all beings." 