As the error was carried out because of the god Indra, he grants Hanuman a wish that his physique can be as potent as Indra's Vajra, Which his Vajra may also not harm him. In conjunction with Indra other gods have also granted him needs: the God Agni granted Hanuman https://vashikaran83737.blogchaat.com/37179572/the-fact-about-hanuman-that-no-one-is-suggesting