As the mistake was carried out with the god Indra, he grants Hanuman a wish that his physique can be as solid as Indra's Vajra, Which his Vajra could also not damage him. Along with Indra other gods have also granted him wishes: the God Agni granted Hanuman a want https://hanuman-mandir-adelaide.mystrikingly.com/blog/exploring-the-spiritual-oasis-hanuman-mandir-in-south-australia