When Lord Hanuman Indulged in a very struggle with Ahiravana, he discovered that it was not possible to get rid of Ahiravana in the fight, and there have to be some mystery about his death. Ramachandra gave Sita a pearl necklace, glittering much like the moonbeams, together with dazzling clothes https://www.youtube.com/watch?v=ufkmD95y7fE&t=1s