As the mistake was done via the god Indra, he grants Hanuman a desire that his entire body would be as powerful as Indra's Vajra, Which his Vajra could also not harm him. In addition to Indra other gods have also granted him wishes: the God Agni granted Hanuman a https://www.reddit.com/user/HanumanJiMandir/comments/1bqn1ir/exploring_the_shani_dev_mandir_in_adelaide/