#skeleton keys

After(heh) Geno suddenly went missing, After!Sans tried to go look for him. So he went looking towards the Void, and pulled…something out. Key. A missing part of him he didn’t know he was missing in the first place.

Unfortunately, pulling Key out of the Void was not the best thing to this already kinda fucked and slightly unstable timeline.

Long story short, the world kind of ended. The timeline didn’t get completely erased into an empty one, but it definitely wasn’t “Aftertale” anymore. Key was basically the only one who remained in the empty world, managing to capture the souls of Frisk and Sans and us holding onto them.

He stays in New Home, in the Underground, the place where Sans and his family lived before…the incident. It’s completely empty, save for him and the two souls. All he knows is that he wants to be whole again, but he can’t do that without retrieving Geno’s part of the soul. After he’s whole, he’s almost certain that he’ll be able to use Frisk’s soul to Reset, to make things as they should be. He’s also trying to pull the others, like Gaster, out of the Void, but so far he’s been unsuccessful.

However. One day, someone from outside of his universe stumbles through. They have this key that when used on certain doors, can open a portal to other universes. Somehow, the key brought that person here, to the broken Aftertale.

Then more people show up. And more. All because of these keys. Naturally, Key takes an interest in this. He finds a key of his own, but doesn’t really want to leave. It feels wrong. But with so many people coming to him, each with unique little souls and worlds, why not…experiment a bit? With their consent, of course. Maybe it could help him with his own soul issues.

Somehow, this ends up with Key becoming the leader of the Skeleton Keys, a group dead set on helping protect the multiverse in their own little ways. Key could care less. He just wants to be whole again, but the more resources he has to find his missing part? The better.

He has no clue that Error is his missing part…until he actually meets him of course. Even with his data being so corrupted, Key can tell that Error is the Geno he was looking for.