As the mistake was done because of the god Indra, he grants Hanuman a desire that his system will be as sturdy as Indra's Vajra, and that his Vajra also can not hurt him. In conjunction with Indra other gods have also granted him needs: the God Agni granted Hanuman https://vashikarantotke37909.ourcodeblog.com/37292831/indicators-on-hanuman-you-should-know