Lifting the latch and pushing the heavy stone door open, you find yourself in a large cavern.  The light is dim and murky, but as your eyes begin to adjust, you see that the walls are covered in green algae and running with moisture.  The floor is strewn with straw.  The atmosphere is warm, damn and fetid, and a soft humming sound fills the air.  You step gingerly through the straw toward a corner of the cavern, where there appears to be a shallow pit.  Peering warily into the pit, you are disgusting to see a mass of pale writhing worms, some as much as a half meter long.  Utterly nauseated, you are about to turn away when you notice that their undulating bodies are swarming around a dagger, its point held fast in a crack in the pit floor.  The hilt is cased in black leather studded with opals, and the blade is fashioned from a strange reddish-black burnished metal you have never seen before.  You long to touch the dagger, but this would mean plunging your hand in among the writhing worms.<br/><br/><em>Your choices are to reach for the dagger, or to back away and leave the cavern.</em>