SPOILERS MAY BE INCLUDES
Custom Stories that either have no enemies used in them at all or new ones that have been created specifically for the CS/Add-on. Mods that have featured both old and new enemies are also accepted. I'll start off with what I know:
The Great Work (featured both old and new monsters)
My Love (featured none at all, except in a scene where the control is taken away)
Tenebris Lake (new monsters exclusively, if you don't count the particular part where the penumbra worm appears, and the
Obscurity (new monsters exclusively)
As of now, this is all I can remember. It would be great if you guys could add to this list as I think many people looking for these kinds of TDD mods would really appreciate it.