As the error was finished through the god Indra, he grants Hanuman a want that his system can be as robust as Indra's Vajra, Which his Vajra can also not hurt him. As well as Indra other gods have also granted him needs: the God Agni granted Hanuman a want https://adelaidepopularhindutemple.blogspot.com/2025/01/exploring-spiritual-essence-of-hanuman.html