Witchaven II: Blood Vengeance/Level 3: Forsaken Realm

From the initial swamp, there's only one path to take for a little bit, though you might want to grab any needed supplies that can be found along the sides of the area.

When you come out to the tan stone area, don't miss the brass key room immediately through the door to the north; it's guarded by Lava Fiends and their accompanying lava.

Now head south and through the first closed eastward door you see. You'll find a sort of peninsula of rock surrounded by more lava, with a passage in the wall across the moat at the far end. You can try jumping across, but flying is safest. The dark area looks quite ominous, but if you use a Night Vision spell (or trust to luck) you'll find that it's just a small space containing the black key.

Go back to the main canyon and keep heading south until you reach a cave with a low path (black key door) and a high one (brass key door). Explore both, the low path has the glass key while the high one leads to the pentagram area.

Now head back north along the tan canyon until you come to a door a little ways past where you got the brass key. You'll know it's the right place if you see a small dark area with hanging skeletons. Head through here to find the exit room.

Tips and secrets:
 * The lava moat in the black key area has some scrolls hidden in it that can be collected with fire resistance or flight.
 * The west loop from the canyon, while not on the completion path, contains some nice items such as a two-handed sword, an ankh, and plate armor.
 * The western circle-and-cross shaped room contains some scrolls and weapons. Don't trust that Nuke scroll though... there's a spike under the discolored floor patch.
 * If you brave the spike trench and lava in the ominous-looking cavern through the door near the brass and black key door area, you can find some more scrolls, including an Open Doors spell.