Anybody know how to get the private dungeon?
its part of the story
when you are asked to bring the catgirl to the guy no matter what you choose if you want to keep her with you or just git rid of her he will tell you he has a friend that will give you the dungeon
You need to do Cassie's route. To start it, visit the slums and force pass the toll guy, then sleep and return to the slums!