undertale reacts gilgamesh (1/??) (@LovelyySaint )

Summary of the AU (alternate universe): A long time ago, monsters and humans fought for the Holy Grail to show which race was superior and also to be able to transcend. After the Second Holy Grail War, humans decided to imprison the monsters. Besides being a potential danger because they could absorb human souls, they had long wanted to exclude them from the War. The monsters manage to free themselves after the events of Fate/Zero.