Add dummy dungeon

Imported from legacy Flarum.

Idk if this is possible and viable but is it possible to have a repeatable instance without any exp/item/money reward for training and testing an instance mechanics and their mobs?

Edit: whoops wrong title.. should be “add dumny instance” :sweat_smile:

Imported from legacy Flarum.
Original author: EvilLumi (Flarum #372)

@[deleted] I think an easier way to do this would be to remove the daily reset for instances.