1E
Along the way to the abandoned monastery complex, the PCs encouter a hermit, who suggests that he accompany the PCs on their journey. They decide it is best that he do so, since he obviously knows the way there.
The monastery is mostly ruined, with only a few pillars of support on the surface, but their guide manages to find an entrance to the extensive monastery dungeons. The PCs prepare to enter, before the guide says "I will go no further; I will wait for you here."
Inside the dungeon, the PCs encounter a group of twelve goblins, lead either by "an especially large goblin" (a subchief) or an orc. The wizard still wipes out a few goblins with his sleep spell, while the dwarven fighter stands in the middle of the room, mostly dodging the goblins' attacks. The rogue pulls off a few shots with his short bow.
The fight takes almost ten minutes of game time, and significantly longer in real time. The group quickly decides to search the room, but wish to do so quickly, since wandering monsters could occur at any moment. Luckily, the elf in their party makes finding the concealed door that "pops" out of the wall easy. When they find the chest, the rogue searches it for traps, and doesn't find the poison arrow trap.
The rogue is poisoned, and dies. However, the group has managed to find a fair amount of wealth, including a red ruby. "No problem" says the dwarf. "We can raise our rogue when we return to the town".
Also in the chest is a +1 longsword, which the fighter takes proudly.
On the way out, the Guide waits for them. He backstabs the fighter, and then sneers "Hand over the red ruby, Or I will kill you all!"
A fight ensues, and the wizard is almost killed. The party returns to the town, broken and battered, but wiser for the experience.