Starfield:One Small Step (MQ401h)

You see Sarah on the floor, not having the best moment of her life. She is angry at you, calling you a monster and telling you that you choked Barrett to death for the Artifacts. Then you meet yourself, an evil version who clearly decided to go the genocide route and you are next on the hit list. They attack you and are not exactly a pushover either. Once they are dead, loot their corpse and move on.