Evil grows beneath the earth Why should anyone travel the cracked cobblestones of the Old Road? The fortress that once cast its shadow across the road does so no longer—some whisper that the earth swallowed the fortress whole in an age long past. Four brave adventurers resolved to discover the truth and set off down the Old Road, but they never returned. The Sunless Citadel is the first in a series of eight stand-alone adventures for the Dungeons & Dragons game. This carefully crafted adventure, designed to challenge 1st-level D&D heroes, follows a path to a mysterious dungeon where evil has taken root, and a terrible tree and its dark shepherd plot in darkness. To use this adventure, a Dungeon Master also needs the Player's Handbook, the Dungeon Master's Guide, and the Monster Manual .