As the mistake was carried out with the god Indra, he grants Hanuman a want that his overall body will be as robust as Indra's Vajra, Which his Vajra may also not harm him. As well as Indra other gods have also granted him wishes: the God Agni granted Hanuman https://freedirectorynow.com/listings13291614/helping-the-others-realize-the-advantages-of-hanuman