Story

Ones there were two bothers called Shumbh and Nishumb. They were troubling the devas and Indra had gone into hiding as he could not defeat them. Chanda, Munda and Rakthbeej had joined hands with Shunbh and Nishubh, after Mahishasur was destroyed. 

Again Sumbh and Nishumbh wanted Kaushaki to marry one of them. To which she again said only the one who could defeat her in battle would be able to woe her. A fierce battle followed. She destroyed Chanda, Munda and was known as chamunda and later Ruru and all the other demons. 

There was a demon called Rakhtbeej who had a special boon. Every drop of blood shed from his body would create another Rakthbeej. Hence, so many Rakthbeej came into existence. So Kaushaki summoned Kalratri to drink up their blood as she slaughtered them. This way he was destroyed.

Later Nishumb was killed and finally Shumbh also met his end.