The Schrade Underworld zone spans the basement sections of Castle Schrade and underground caves. During the time Schrade was abandoned, the cave system was filled with ocean water, apparently coming all the way from the shoreline caves during an extremely hot summer, the water collapsed the walls of Schrade's basement, filling the entire lower level with water. Slowly, the water levels started to lower, wild life on the dark waters adapted for amphibian life, with the recent defeat of the Sun Black Fatalis Castle Schrade can now be explored.