As the error was accomplished through the god Indra, he grants Hanuman a desire that his human body can be as robust as Indra's Vajra, and that his Vajra might also not harm him. In conjunction with Indra other gods have also granted him needs: the God Agni granted Hanuman https://calebz074psu4.bloggactivo.com/36157156/beej-mantra-no-further-a-mystery