In Hindu mythology, Mahishasura was an asura.

Mahishasura's father Rambha was king of the asuras, and he once fell in love with a water buffalo; Mahishasura was born out of this union. He is therefore able to change betweenhuman and buffalo form at will (mahisha = buffalo).

Despite being a demon (the word asura used to mean "not-god" and does not have as strong a negative connotation as "demon"), Mahishasura was also pious in his meditation to Brahma. Eventually, Brahma granted him a boon that he could not be defeated in battle by any man or god.

After this he started terrorising Heaven (Swarga Loka) and earth (Prithvi). He invaded heaven, defeating the king of gods Indra, and drove all the gods (devas) out of heaven.

The gods then went into conclave to decide what could be done with this invincible asura. Since he was invincible to all men, they created his nemesis in the form of a young woman, Durga (a form of Shakti or Parvati). She combined the powers of all the devas in a beautiful form. The goddess then attacked Mahishasura's empire, and after nine days of fighting, during which Mahishasura's army was decimated, she finally killed him on the tenth day of the waxing moon.Durga is therefore called Mahishasuramardini (mardini = killer, fem.), the destroyer of Mahishasura.

During several battles, she appears in her incarnation of Kali; particularly while fighting Raktabija, who has the magic boon that every drop of blood falling from him to the ground will become another Raktabija (rakta=blood, bija=seed). Here Kali spreads her gianttongue and drinks up all the blood before it falls to the earth.

The event is celebrated in various versions as Durga Puja in Bengal and Orissa, and as Dussehra and navaratri in other parts of India, celebrating this victory of good over evil.

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