As the mistake was performed with the god Indra, he grants Hanuman a wish that his system would be as potent as Indra's Vajra, Which his Vajra may also not hurt him. Together with Indra other gods have also granted him needs: the God Agni granted Hanuman a want that https://shanidevmandiradelaide.blogspot.com/2024/07/exploring-spiritual-haven-hanuman.html