As The error was accomplished from the god Indra, he grants Hanuman a want that his human body can be as powerful as Indra's Vajra, and that his Vajra also can not hurt him. In conjunction with Indra other gods have also granted him needs: the God Agni granted Hanuman https://hindutempleadelaide.tech.blog/2024/11/16/spiritual-landmarks-in-adelaide-a-journey-of-faith-and-tradition/