As the mistake was done through the god Indra, he grants Hanuman a desire that his overall body would be as potent as Indra's Vajra, Which his Vajra may not harm him. Along with Indra other gods have also granted him needs: the God Agni granted Hanuman a desire that https://directoryalbum.com/listings13364138/not-known-factual-statements-about-hanuman