As the mistake was done because of the god Indra, he grants Hanuman a desire that his physique could be as robust as Indra's Vajra, and that his Vajra may also not damage him. In conjunction with Indra other gods have also granted him needs: the God Agni granted Hanuman https://hindutemplesinadelaide.home.blog/2025/02/17/hanuman-temples-and-hindu-worship-in-adelaide/