As the error was accomplished with the god Indra, he grants Hanuman a desire that his entire body will be as robust as Indra's Vajra, and that his Vajra might also not hurt him. In conjunction with Indra other gods have also granted him needs: the God Agni granted Hanuman https://cashmsspk.blogtov.com/17549214/5-simple-statements-about-hanuman-explained