Get System Off back?

I recently deleted all activities for a room and recreated, trying to clean up some functionality that wasn’t working correctly. Prior to redo, there was a System Off option that got created somehow. It was the only thing that truly shut everything down (Setup | On Stop always had quirks). How is the System Off created? How do I get that back?

Just create an Activity and set it to be System Off. Or create a fresh room and Roomie does it for you.