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Darksiders II possesses a "Crucible Mode" which is actually an arena with challenges. This mode is open after the player finishes the story (the ad says "After Death show yourself worthy," then maybe finish the story, or sometime it).
THQ also confirmed that there will be a "New Game +" with all the skills and equipment of the day before.
Source link: http://www.rewtec.com/t2089-multi-darksiders-2#46303