As the error was accomplished through the god Indra, he grants Hanuman a desire that his overall body could well be as potent as Indra's Vajra, Which his Vajra can also not damage him. In addition to Indra other gods have also granted him needs: the God Agni granted Hanuman https://www.diigo.com/item/note/avyq4/5tku?k=b318ecb5521f76a3502accce97fdeb7c