Chronicle Me Viking: Ascension

Tondalaya discovers she has a twin sister, Tawnya. But the reunion is short lived as Tondalaya is hurled back into the past to try to save the world from its impending doom. But regardless of what she does time repeats itself and she has to make the hard choice of killing the one who bends time to their will, her sister. Will Tondalaya have the strength to destroy Tawnya, or will she be destroyed?