Kali was a demon, the personified spirit of the Fourth yuga who possesses Nala. In Hinduism, Kali (Devanāgari: IAST: kali, with both vowels short; from a root kad, "suffer, grieve, hurt; confound, confuse") is the reigning lord of Kali Yuga and archenemy of Kalki, the 10th and final Avatar of the Hindu God Vishnu. In the Kalki Purana, he is portrayed as a demon and the source of all evil. In the Mahabharata, he was a gandharva who possessed Nala, forcing him to lose his Kingdom in a game of dice to his brother Pushkara. His most famous incarnations are Ravana and Duryodhana. Kali is similar to the demon Kroni and his incarnation Kaliyan of Ayyavazhi mythology.