As the mistake was performed by the god Indra, he grants Hanuman a want that his overall body would be as solid as Indra's Vajra, Which his Vajra may also not damage him. Coupled with Indra other gods have also granted him wishes: the God Agni granted Hanuman a wish https://laxmi63827.onesmablog.com/considerations-to-know-about-hanuman-77845936