The World's Largest Dungeon.

Shafirs Talon stood with the others at the entrance to the tunnel. Despite his calm outward appearance, doubt and fears filled the young hobgoblin monk. Vaki's visions and the subsequent appearance of the runic tatoos upon thier faces left no doubt in his mind their mentors were dead. Would they be able to succed, where their masters had failed? Once they entered, would they be able to make it, back out? Who were these two strangers the visions spoke of?
He glanced at his companions, they too stood still, staring a the tunnel ahead of them. Vaki, the Monkey Shaman, Tick Tick, a Thri-kreen Soulknife, Cora a halfling Sorceror and her familar Arnold, And Shall, a fire elf rogue. All marked by the strange tatoos, all ready to die, so that others can live.
The tunnel opened up to a large rectangular room, the walls were made of smooth stone. The north side of the room lay in total darkness, a darkness so complete, even Talon's darkvision couldn't penatrate it. This was it the point of no return. Slowly, one by one, the heroes stepped into the darkness.