The Cave of Thackus is a dungeon in Valkyrie Profile, situated on the Southeastern coast of Midgard. It is a byproduct of the magical experiments in nearby Flenceburg, and the water that is dammed up inside threatens to pollute the entire shoreline. Some of the flooded sections inside the Cave are navigated with the help of lily pads. The dungeon is only available on Normal and Hard mode, from Chapter 4 onwards.