The Heart Beast is the fourth challenge of the Enchiridion, appearing in “The Enchiridion!” The Heart Beast is given to Finn by the Dark Magician, and the Dark Magician claims that it is “completely evil”. Finn easily slays the Heart Beast, it explodes and lots of blood comes out. The Heart Beast had no known face, but it looks a lot like a human heart. It has a skeletal electric arm but considering Finn destroyed it so fast, what the arm actually does is unknown. The Heart Beast appears to be a giant.