As the error was done through the god Indra, he grants Hanuman a wish that his body could well be as potent as Indra's Vajra, Which his Vajra may not damage him. Along with Indra other gods have also granted him wishes: the God Agni granted Hanuman a wish that https://directoryalbum.com/listings13364138/not-known-factual-statements-about-hanuman