As the mistake was accomplished through the god Indra, he grants Hanuman a desire that his body can be as powerful as Indra's Vajra, Which his Vajra can also not damage him. Coupled with Indra other gods have also granted him wishes: the God Agni granted Hanuman a want that https://directoryweburl.com/listings13075768/5-simple-statements-about-panchmukhi-hanuman-explained