As the mistake was done because of the god Indra, he grants Hanuman a want that his system can be as powerful as Indra's Vajra, Which his Vajra may also not hurt him. As well as Indra other gods have also granted him wishes: the God Agni granted Hanuman a https://vashikarantotke81233.pointblog.net/hanuman-an-overview-83661962