There’s a tale whispered in every darkened corner of Waterdeep about a place of unspeakable danger and irresistible allure.
Hidden in plain sight is the Yawning Portal, a well-known tavern famous for its namesake: a gaping pit in the center of its common room. This isn’t just any hole in the ground. It’s the entrance to Undermountain, a sprawling, labyrinthine dungeon that only the bold—or the foolish—dare to explore.
Legends speak of Halaster Blackcloak, the Mad Mage, who has ruled these shadowed depths for centuries. His motives are unknowable, his magic unfathomable. Some say he seeded his domain with unspeakable horrors, deadly traps, and secrets beyond imagining. Others believe he thrives on the chaos that adventurers bring, feeding his own twisted amusement.
Few who enter Undermountain return, but those who do carry wild tales of treasures beyond measure, creatures from nightmares, and mysteries that defy explanation. The deeper you go, the stranger it gets. Somewhere in those depths lies Skullport, a haven for outlaws and cutthroats, shrouded in shadow and intrigue.
The rumors are true: Undermountain is no ordinary dungeon. It’s a proving ground for heroes, a vault of the unknown, and perhaps the most dangerous place in all Faerûn. Enter if you dare—but know this: Halaster is watching, and he delights in testing those who tread his halls.