The Quicksand Man

The Quicksand Man is an evil chalk creature made of sand that can put people to sleep and settles into quicksand, to send them into his realm called the Nightmarerium. The Nightmarerium is a dreaded place that manifest one's worst nightmares, and after awhile, those trap in it becomes in mindless slaves. After he sent all the people of of ChalkZone into the Nightmarerium, Rudy escaped by dunking his head in cold water. Rudy then whet into the real world to weak everyone up by scraping a chalkboard (the screech is amplified in ChalkZone), which was the also the Quicksand Man weakness.