As the error was carried out because of the god Indra, he grants Hanuman a wish that his physique could be as powerful as Indra's Vajra, and that his Vajra also can not harm him. Together with Indra other gods have also granted him wishes: the God Agni granted Hanuman https://freemanu863otx6.blogdiloz.com/31887176/considerations-to-know-about-bajrang-baan