As the error was performed with the god Indra, he grants Hanuman a desire that his human body would be as strong as Indra's Vajra, Which his Vajra could also not damage him. Along with Indra other gods have also granted him wishes: the God Agni granted Hanuman a desire https://adelaidepopularhindutemple.blogspot.com/2025/03/shani-dev-temple-sacred-space-for.html