As the mistake was done through the god Indra, he grants Hanuman a want that his system might be as powerful as Indra's Vajra, Which his Vajra can also not damage him. In addition to Indra other gods have also granted him wishes: the God Agni granted Hanuman a wish https://hanumanmandiradelaide.art.blog/2024/06/14/discover-the-spiritual-heart-of-adelaide-the-hindu-temple-in-adelaide/