Ur-Devil (also refered in game as the Deepest Darkness) is a boss fought in Etrian Odyssey 2 Untold, during the DLC quest "Original Sin," on the newly added (by the DLC) 31st floor. This grotesque creature, resembling a rotund humanoid sitting atop a mass of writhing tentacles, reigns over the final floor of the Yggdrasil Labyrinth, the Dark Paradise. Being the darkest secret the forest has to hide, the Ur-Devil is by far the most powerful enemy the heroes of Lagaard will face in their journey, and one of the most powerful entities in the entire series.