In the "Adi Parva" (Book 1) of the epic "Mahabharata", the divine sage Narada tells the Pandava brothers the story of the destruction of demon brothers Sunda and Upsunda due to the apsara Tilottama and warns the Pandavas that their common wife Draupadi could be a reason of quarrel between them. The tale states Sunda and Upasunda were sons of the asura (demon) Nikumbha. They are described as inseparable siblings who shared everything: the kingdom, the bed, food, house, seat. Once, the brothers practiced severe austerities on the Vindhya mountains, compelling the creator-god Brahma to grant them a boon. They asked for great power and immortality, but the latter was denied, instead, Brahma gave them the boon that nothing but they themselves can hurt each other. Soon, the demons attacked heaven and drove the gods out. Conquering the whole universe, the demons started harassing sages and creating havoc in the universe.