As the mistake was completed because of the god Indra, he grants Hanuman a desire that his body can be as sturdy as Indra's Vajra, Which his Vajra may also not hurt him. Together with Indra other gods have also granted him wishes: the God Agni granted Hanuman a want https://gircowgaushalaadelaide.blogspot.com/2025/01/discovering-spiritual-heart-of.html