The Dungeon of Fire was found in the midst of a lava lake, south-east of Britain in the Sosaria of Ultima III. The Dungeon of Fire was a difficult dungeon, full with traps and teleporters, which would confuse the unwary one. It also was infested with Gremlins. However, on the lowest levels were found the Marks of Fire and Force, although it was a little difficult to get both of them without some backtracking.