Stage of History

The Stage Of History, also referred to as "The Stages Of History" is a landmark location in Bro Warriors.
It is explained as an ancient plane that governs history and time. It is unknown as to whether or not it was man-made. It isn't seen in-game except at the stage select screen, however it is mentioned numerous times in the story. It acts sentient, but the fact remains that it is still a mystery.
Due to the awakening and rising of the Xaggis Empire, The Stage of History teleported people from the modern world into the past due to a time paradox.