Katyayani is incarnation of Goddess Parvathi, daughter of a sage Katyayana and is one of the most violent forms of Goddess Durga. Katyayani has four hands and is depicted riding a lion. At some places Goddess Katyayani is worshipped by young girls to get husbands like Lord Krishna.
Day 7: Kalaratri
Kalaratri is the most ferocious form of Goddess Durga and an incarnation of Parvathi. It is believed that Goddess Parvathi has removed her fair skin to kill the demons Sumbha and Nisumbha. Goddess Kalaratri is shown wearing a white sari and fiery eyes, her body turned black. She is believed to protect her devotees from harm.
Day 8: Mahagauri
Mahagauri is depicted riding a bull and is also called Shwetaambardhara, because of her extremely fair complexion. She represents intelligence and peace and blesses her devotees with purity, removing their sins and calming their lives.
Day 9: Sidhidatri
Goddess Sidhidatri is depicted sitting on a lotus and is believed to bestow his devotees of all types of Siddhis (paranormal powers). She has four arms and holds a lotus, Sudarshan Chakra, mace (gada) and Shankha (conch shell) in each of her hands.