Shakti is worshiped as the Supreme Being. Shakti embodies the active feminine energy of Shiva and is identified as Mahadevi or Parvati.
Shakti (Sanskrit pronunciation: [ˈʃʌktɪ]) (Devanagari: शक्ति; from Sanskrit shak, "to be able"), meaning "Power" or "empowerment," is the primordial cosmic energy and represents the dynamic forces that are thought to move through the entire universe in Hinduism.


Chhinnamasta's story:

The third Mahavidya is Cinnamasta. Listen to the story of Her origin from the Pancharatna Grantha. Once Parvati went with Her friends Dakini and Varnini to take a bath in the Mandakini River. Parvati was feeling very happy and a lot of love was welling up inside Her. Her complexion darkened and the feeling of love completely took over. Her friends on the other hand were hungry and asked Parvati to give them some food. Parvati requested them to wait and said that She would feed them after a while, and began walking. After a short while, Her friends once again appealed to Her, telling Her that She was the Mother of the Universe and they Her children, and asked to be fed quickly. Parvati replied that they should wait until they got home. Her friends could not wait any longer and demanded that their hunger be satisfied immediately. The compassionate Parvati laughed and with her finger nail cut Her own head. Immediately the blood spurted in three directions. Her two friends drank the blood from two of the directions and the Goddess herself drank the blood from the third direction. Since she cut Her own head, she is known as Cinnamasta. Cinnamasta shines like a lightning bolt from the Sun. She demonstrates the rare courage needed to make the highest conceivable sacrifice. May we imbue that very same courage from that daring Goddess!