I'm so sorry everybody. I can't really finish this. You see, I only work out the beginning, the end, and the key parts of the center. I know how to end this, but I just lost all interest in actually writing this. I was going to have it so that Frisk would end up sacrificing themselves when they came face to face with Sans and Dice. Dice, who had been friends with Frisk when nobody else would, went on to break the barrier while Sans used Frisk's soul to revive the monsters whose dust was in Dice's jar.
If somebody wants to adopt this PM me. You can also change the end or something but please don't make Frisk and Chara into psychopaths if you can help it.