Back to using the Map and Dice Playing Cards to generate a random dungeon.

With the party entering this dungeon through the Grim Gate (Ace of Spades) I see this being a long forgotten dwarven outpost on the side of a mountain.

The path leading up to the Grim Gate is a small, worn trail, More likely to be dismissed as a goat path than once belonging to battle harden dwarven warriors.

I like the idea of stealing from Tolkien and Lord of the Rings and that famous door to Moria scene. So to get into the dungeon the party will have to work out how to open the Grim Gate. However each failed attempt increases the likely hood that some unseen horror will appear and attack the party. I’d use clues like the temperature starts to drop, they notice some rocks falling etc.