Battles during Harmonic Convergence (171 AG)

Armageddon is an apocalyptic battle between Korra and Vaatu/Unalaq during the Harmonic Convergence in 171 ASC. After Korra failed to prevent Vaatu from escaping, Unalaq and Vaatu merged to create the Dark Avatar, and plunged the world into darkness. Korra lost Raava's light, but used Energybending to connect with her inner self and produce an astral projection that made a final stand against Vaatu. However, Jinora was able to extract Raava's light and reconstituted the being to help Korra. Unalaq's final defeat marked the end of the Water Tribe Civil War and the Dark spirit incidents.