As the error was done by the god Indra, he grants Hanuman a desire that his system could be as sturdy as Indra's Vajra, Which his Vajra might also not hurt him. In conjunction with Indra other gods have also granted him wishes: the God Agni granted Hanuman a want https://shanimandiradelaide.blogspot.com/2025/06/where-faith-finds-purpose-soulful-heart.html