From publisher blurb:
The Lair of Ysmorg is a one level dungeon lair designed for the Adventurer, Conqueror, King system.
Face the beastman horde of Ysmorg the Brutal, lairing in a derelict dwarven fortress. Exploit the internal power struggles of the monsters to infiltrate their ranks and pit them against each other.
Delve ancient dwarven halls full of secret corridors and traps. Encounter a vengeful dwarven spirit use its knowledge of the fortress to your advantage.
The lair of Ysmorg is a compact adventure scenario for a party of 4-6 characters of levels 3-6, playable in about 1-2 sessions.
Sneak, bribe, persuade or break your way into Ysmorg’s fortress to end the looming beastman menace!
Background
Recently, Ysmorg the Brutal, a huge bugbear chieftain, has subdued a hobgoblin clan. Feeling confident in his growing horde, he decided to establish an outpost in a derelict fortress close to the borderlands. He plans to loot remote settlements until his forces have grown large enough to make a focused assault on one of the border-forts.
One danger to Ysmorg’s ambitions is that his sub-chieftain Gormak plans to assassinate him to take over the tribe. While Ysmorg is aware of Gormak’s envy, he doesn't think anyone under his rule has the guts to stand up to him.