As the error was accomplished through the god Indra, he grants Hanuman a desire that his body could be as potent as Indra's Vajra, and that his Vajra might also not hurt him. Coupled with Indra other gods have also granted him needs: the God Agni granted Hanuman a desire https://hindutemplesinadelaide.blogspot.com/2024/06/hanuman-mandir-adelaide-revered-hindu.html