Durga and her assistants, the Matrikas, wound the demon Raktabija, in an attempt to destroy him. They soon find that they have worsened the situation for with every drop of blood that is dripped from Raktabija he reproduces a clone of himself. The battlefield becomes increasingly filled with his duplicates. Durga, in need of help, summons Kāli to combat the demons. It is said, in some versions, that Goddess Durga actually assumes the form of Goddess Kāli at this time.