Welcome to the GM's Day sale! From now through March 15th, this title has been marked down by 30%! For more values, visit our GM's Day sale page.
Some things are better left buried and entombed, like an entire castle that slid into the earth 1000 years ago, hiding its shameful secrets. It was only a matter of time until it its doors were blundered upon and unsealed, unleashing unimaginable horrors upon a small town.
What unknown abominations stir in the slimy subterranean castle? Something has punctured through from another plane of existence. It has tasted your world and found it easy to digest. Worst of all now you have been afflicted by its presence and you must save yourself as well.
Can anyone survive the Trial of the Underkeep?
19 New Creatures - that are itching to digest your party
26 New Treasures - that urge your PCs to stab each other in the back!
2 New Spells and 1 New Ritual - that just might save lives (if it is found!)
New Crazy Poison and a Terrifying Disease
Custom Sleep Encounters Table
Optional Fumble Table
Fearful Situations that Test Brains Over Brain
Brimming With Full Color Illustrated Maps & Monsters
New & Final "Revision 2.0" with Added Artistic Flare and Updates