Club Sacrifice is a casual roleplay set in a building based off The 3rd Birthday's Club Sacrifice building.
The difference between the canon CS building and this one is that there is an arena, since fighting in the main building is prohibited.
After the death and destruction brought about by the Twisted, Club Sacrifice has been going through extensive reconstruction. The majority of the old staff were killed by various types of Twisted so Club Sacrifice is hiring new staff. The building is rather large, built to be able to hold large concerts. Currently it is under new management, and somehow it has become a nexus of sorts. The lines between realities are blurred; entering and exiting the building is crossing into a gray area. Perhaps an unintended side-effect of the twisted's existence. However, violence in the main building is prohibited and magic tends to be exceptionally weak here, virtually nonexistant when not in the arena.
CS is set in a nexus-like environment. As long as your character follows the rules, they're allowed.