As the error was done by the god Indra, he grants Hanuman a desire that his overall body will be as robust as Indra's Vajra, Which his Vajra could also not harm him. In addition to Indra other gods have also granted him needs: the God Agni granted Hanuman a https://www.diigo.com/item/note/avyq4/uqer?k=e5ffe019b3bc918e415ba0556a185099