Volcano

From the Introduction:

Through volcanic eruptions the whole countryside has turned into a hellish nightmare. Although this volcanic crater is only one of many smaller vents surrounding the main crater it can be reached only after an arduous climb, past rivers of molten rock and through a rain of smouldering boulders. Even the air itself is hot enough to make every breath painful. This small crater is currently in one of its quieter stages and only emits stream of quick flowing molten rock. All around the crater the smouldering boulders from its last more violent eruption still give testament to violent forces of destruction that can be unleashed by even such a small vent.