As the mistake was performed because of the god Indra, he grants Hanuman a want that his overall body could be as powerful as Indra's Vajra, and that his Vajra could also not damage him. In addition to Indra other gods have also granted him needs: the God Agni granted https://hanumantempleadelaide.news.blog/2024/08/08/exploring-the-spiritual-heart-of-adelaide-hanuman-mandir/