Kali is the primordial feminine energy of creation. She is Shakti, the force that brings creation. While Siva is formless, Shakti is form (creation). Kali is worshiped as the destroyer of the ego, the sense of individuality. She is depicted standing over Siva, displaying Her power over the Lord of creation, with a garland of skulls and lashing red tongue. This is how the ego perceives Kali, as it’s destroyer. There is nothing our sense of self fears more than its own destruction. The Divine Mother, as Kali, severs the head of your ego returning you home, to the awareness of your true self, Pure Consciousness.
Jai Kali Ma! (Victory to the Divine Mother Kali)