As the mistake was accomplished through the god Indra, he grants Hanuman a wish that his overall body will be as powerful 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 a wish https://keeganpwbhm.ltfblog.com/35801332/the-best-side-of-hanuman