If you're looking to design a bad dungeon, you can take a few pointers from Dave Hargrave. His most salient advice? Secret doors. Lots and lots of secret doors.
Dave Hargrave designed four adventures for use with his Arduin Grimoire game system. The first adventure, entitled "Caliban", was designed for 8th+ level characters. Caliban is purported to be a ageless, self-aware, malign tower formerly lost to time and space and now revealed once more, for your looting pleasure.
Caliban's adventure maps provide few hints of a towered structure. Instead, Hargrave fills each dungeon map-page to the border with odd-sized rooms and interminable secret doors.
The front and back covers are by one of my otherwise favorite Arduin illustrators, Brad Schenck. The front cover is not one of his best efforts.
Brad Schenck's back cover is better, though still not stellar, by any stretch of the imagination.
|Treasure: Living Scroll, Hell Hand, Demon Ring, Idol of Doom|
Skeleton Key, Dragon Horn, Silver Cat's Garb, Black Belana's Garb
This adventure is accompanied by two sheets of cards, one containing treasures and the other one containing new monsters.
|Monsters: Death Tree, Kraken, Wardroid, Warwheel|
Dragon Wurm, Phoenix, Death Hydra, Quetzocoatl
The artwork on both card sheets is by Greg Espinoza.