As the mistake was performed from the god Indra, he grants Hanuman a desire that his entire body will be as solid as Indra's Vajra, Which his Vajra also can not damage him. Along with Indra other gods have also granted him wishes: the God Agni granted Hanuman a want https://shivjimandirsydney.blogspot.com/2024/09/discovering-rich-heritage-of-indian.html