As the mistake was carried out because of the god Indra, he grants Hanuman a desire that his system would be as powerful as Indra's Vajra, and that his Vajra can also not damage him. As well as Indra other gods have also granted him needs: the God Agni granted https://freekundali80901.bloggerchest.com/32683931/the-definitive-guide-to-hanuman-mantra