As the mistake was finished through the god Indra, he grants Hanuman a desire that his body can be as strong as Indra's Vajra, Which his Vajra also can not hurt him. Along with Indra other gods have also granted him wishes: the God Agni granted Hanuman a want that https://holivesheshsadhna83716.thenerdsblog.com/38510514/5-simple-statements-about-panchmukhi-hanuman-explained