As the error was carried out with the god Indra, he grants Hanuman a want that his overall body will be as potent as Indra's Vajra, and that his Vajra can also not harm him. In addition to Indra other gods have also granted him wishes: the God Agni granted https://shanimandirinadelaide.blogspot.com/2024/07/a-deeper-dive-into-hanuman-mandir.html