As the error was done via the god Indra, he grants Hanuman a desire that his body would be as solid as Indra's Vajra, Which his Vajra also can not hurt him. In addition to Indra other gods have also granted him needs: the God Agni granted Hanuman a wish https://shrihanumanmandiraustralia.blogspot.com/2025/08/indian-temple-adelaide-celebrating.html