As the mistake was accomplished through the god Indra, he grants Hanuman a desire that his human body will be as robust as Indra's Vajra, Which his Vajra also can not hurt him. Coupled with Indra other gods have also granted him wishes: the God Agni granted Hanuman a want https://lifewebdirectory.com/listings13329619/the-single-best-strategy-to-use-for-hanuman