The gods then combined their divine energies and created Goddess Durga. Driving on a lion, she fought a intense fight with Mahishasura for 9 days And at last emerged victorious on the tenth day, which is celebrated as Vijayadashami or Dussehra. Durga herself is considered as being the "Self" inside https://www.youtube.com/watch?v=S1HpMpEww4Q