As the mistake was performed from the god Indra, he grants Hanuman a desire that his system could be as powerful as Indra's Vajra, and that his Vajra also can not hurt him. Along with Indra other gods have also granted him wishes: the God Agni granted Hanuman a want https://laxmi55432.alltdesign.com/the-basic-principles-of-panchmukhi-hanuman-52134419