Few remembered the path to the postern gate and even fewer traversed it. Ten days of lashing winds and treacherous footing led them to the fabled passage. Certain ambush laid ahead, but there was no retreating now. The Great Roc was on the hunt.
What lays beyond the postern gate is up to you, but here are a few ideas:
A dwarven surface colony erected beneath the Great Roc’s aerie. The faithful wish to transcend the bounds of the earth.
A monument to hubris stuffed full of gold. The ghosts of keepers past may take issue with lowborn scum pilfering their treasury.
A hamlet that was devoured by trolls. An infamous bandit has since subjugated the trolls and styled themselves ruler of the mountain.