Crystalline Demon

The Crystalline Demon is a monster who made a brief appearance in the episode "The Limit". It is a blue demon-like creature with red rubies for eyes. Since it is comprised of a crystalline compound, it may have come from the Crystal Dimension. The demon is among the many inhabitants of the Maze. It is unknown whether Finn and Jake encountered it during their journey through the maze, though it they walk near it while Finn is singing "Sing Cause Yo Mama Said." It also appears on the episode's titlecard.