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.


Kali's story:
First of all Sati took the form of Kali. Her form was fearful, her hair untied and loose, her body the color of a dark cloud. She had deep set eyes and eyebrows shaped like curved swords. She stood on a corpse, wore a garland of skulls, and earrings made from the bones of corpses. She had four hands – on one hand she had the head of a skull, and the other a curved sword with blood dripping on it. She had mudras on her other two hands – one giving freedom from fear and the other giving blessings. She roared and the ten directions were filled with that ferocious sound. The exploits of this Goddess Kali are outlined in the Chandi Path. She is the Goddess that killed Chanda and Munda and also drank the blood of Raktabija. She is known as Kaushiki, She who came from within, and is the Slayer of Shumbha and Nishumbha. Kali is the first of the Das Mahavidyas. She is beyond time. She takes away the darkness and fills us with the light of Wisdom, which is why She is the embodiment of Jnana Shakti. She resides in the cremation grounds, where all creation dissolves. To learn Her Bija Mantra and Gayatri