Axel brought out a large leather bag embroidered with many magical symbols. Once again he told them that all twelve were to put their hands in the bag at once. Each was to grab a bean; then all were to draw their hands out.
They did so -- and once all hands were in the bag, a glowing light enveloped all twelve -- a "geas light" binding them. They didn't understand how exactly four would draw black beans since there were obviously many hundreds of beads in the bag. But when they opened their hands there were exactly four who drew black beans.
So in the morning Olaf, Taggert, Conrad and Sperl would select an entrance and venture into the dark unknown.
Two fighters, a cleric and a hobbit . . . which, if any would again see the light of day? We will have to wait and see.