As the error was finished because of the god Indra, he grants Hanuman a want that his entire body would be as robust as Indra's Vajra, Which his Vajra may also not hurt him. In addition to Indra other gods have also granted him needs: the God Agni granted Hanuman https://indiantempleadelaide.tech.blog/2024/02/22/spiritual-journey-puja-at-hanuman-ji-mandir-south-australia/