Dustshift is an Undertale alternative universe based on Storyshift created by VoltraTheSparking. It is set in mostly the same setting as the original, but with a bigger focus on the characters, realism and drama.
The AU's narrative is told through the eyes of Chara, a teenage human who was pardoned by the ruler of monsters, Sans, kickstarting a major rebellion movement in the form of the Solar Warriors. Eventually, a murderer named Shifty enters the frame and begins to massacre the population, leading Chara down a severely dark path in order to stop them and protect her loved ones.