L20. Passage to the Underdark

If the characters get access to this tunnel without Stahlmast collapsing the ceiling to cover his escape, read:

A dark, cool tunnel twists down into the mountain, the air growing ever more stagnant. Glowing fungus begins to appear on the walls, which glisten with moisture.

Any character who succeeds on a DC 12 Intelligence (History) check understands that this passage is descending into the Underdark—and knows how incredibly dangerous that subterranean realm is. You might have ideas for other adventures that could lead the characters into the depths, but the players should understand that a successful expedition would require research and resources. For now, the characters are better off heading back and finishing their business in Stahlmast’s lair and in Hupperdook.

Parent Plot

3. Stahlmast’s Lair