Though the door is unmagical in nature, it has been inert for a long, long time. But steadily, at the notes take hold, the party can hear a low grinding starting from within. Warped and bent though it is, the large bolt retreats. The door trembles, shaking off centuries of dust and gravel, and a deep, reverberating boom echoes in the cavern… as one might expect from knocking at a metal door. With a grace that defies its state, the door cracks free of its frame. (The party will have to finish pulling it open, which can be done by anyone with a physical power stat of B or higher, but the hard part is past!)

From inside comes a cold gust of stale air. It's still pitch-back, but shining a light within rewards the team with the sight of cultivated stonework. This floor is in significantly better condition! The flagstones are covered in dust, but they are mostly intact. Empty wall sconces line an otherwise plain corridor ahead.