Even though the Mane Six forgave Starlight for everything she did, the pit of guilt in her stomach has still not gone anywhere since then. So Starlight thought it'd be a good idea to relax and play a game just to get things off her mind for a while. Taking some advice from Twilight about this particular game, she was told to do the "bad" route, meaning she had to kill everything in sight.
Starlight cursed herself for taking that advice once she saw just what awaited her.
A kinda sorta crossover with Undertale. What happens when you take a mare that really blows things out of proportion and is angered easily and pit her against the most rage inducing and unfair boss in video game history? Hell. That's what you get.
Rated Teen for language. Drama tag for some of Starlight's thoughts before the Sans fight, and Comedy tag for Starlight's thoughts and dialogue DURING the Sans fight (and for Twilight being a troll.)
Contains spoilers for Undertale's Genocide run.