This is probably what would happen if two supreme deities tried to create something. By supreme deity, I mean someone like Error 404 or Alphatale Sans. But, the AU also resembles Reaper in a way, so I wouldn't be surprised if he had something to do with it. Another possibility is if there was an Ink Gaster, he'd seem like someone capable of creating something like this.
This is probably what would happen if two supreme deities tried to create something. By supreme deity, I mean someone like Error 404 or Alphatale Sans. But, the AU also resembles Reaper in a way, so I wouldn't be surprised if he had something to do with it. Another possibility is if there was an Ink Gaster, he'd seem like someone capable of creating something like this.