Procedural Dungeon

I am going to make another dungeon have a procedural dungeon door, where you can go back in and fight the mobs again. (This will work the same as the recently added procedural Swamp dungeon). Which one should I do next?

(Note - I skipped Dino for now because you don't actually fight any mobs in that chapter, so I'll have to figure out a special plan for that later)