Kali - Mahavidya

Kali stands on Shiva

Kali is one of the Mahavidyas. Krishna avatar of Vishnu is portrayed at the bottom.

Image of Satguru Sivaya Subramuniyaswami
But you must remember that even the greatest souls have had nightmares, confusions, heartbreaks, disappointments, losses, desires that have been unfulfilled and experiences that they have not been able to cognize.
—Gurudeva