As the error was accomplished because of the god Indra, he grants Hanuman a desire that his entire body will be as powerful as Indra's Vajra, Which his Vajra can also not harm him. Along with Indra other gods have also granted him wishes: the God Agni granted Hanuman a https://hindutemplesinadelaide.blogspot.com/2024/07/a-deeper-dive-into-hanuman-mandir.html