Damp Darkness is set in a map similar to Shifting Passages, but without its special features of growing walls and changelings. The monsters are Bloo Goo, Djinn, Golem, Dancing Blade, and Imp. The boss is a level 10 Djinn. Since so many monsters blink, blackspace will run out quickly.
This has worked at least one time. I took a Gnome, prepped Bear Mace and Flame Magnet, worshiped Jehora Jeheyu early, and used his guaranteed WEYTWUT to position the boss at one end of a very long wall. Took one shot each of Boost Health and Boost Mana. Ran out of blackspace at level 5 and fireballed him a couple times, since my health was too low to hit him. Mid-fight leveled to 6 and fireballed a couple more times. Took Chaos Avatar to level to 7, hit him once, and used PISORF until he died, glugging gnomish mana potions along the way.