As the error was completed because of the god Indra, he grants Hanuman a would like that his entire body will be as potent as Indra's Vajra, Which his Vajra could also not harm him. Coupled with Indra other gods have also granted him needs: the God Agni granted Hanuman https://www.diigo.com/item/note/avyq4/uqer?k=e5ffe019b3bc918e415ba0556a185099