The gods then merged their divine energies and established Goddess Durga. Using on a lion, she fought a intense fight with Mahishasura for 9 days And eventually emerged victorious over the tenth day, that's celebrated as Vijayadashami or Dussehra. One more nicely-recognised mythological story is the slaying of demon Raktabija. https://www.youtube.com/watch?v=S1HpMpEww4Q