28. Climb Down Tunnel

(irregular room, 30'x20' section with 30'x20' section attached to north 20' of east wall, door south in southwest corner) The floor of this room is covered with flagstones, each about four feet square. You can see that a flagstone in the northeast corner of the room has been pried up, then roughly replaced. If a character lifts the flagstone: You see a tunnel descending straight down. A tarnished but sturdy-looking metal ladder is attached to one side of the tunnel. If a stone is dropped into the hole, it will never be heard to hit the bottom. If a torch or other light is dropped into the hole, the characters will see that it drops further and further until goes so far that it seems to fade away. If one or more characters decide to descend the ladder, they may climb down as long as they wish but they will never reach the bottom. Characters who observe from above will see the descending character(s) get further and further away, and climbing back up will take as long or longer than climbing down. As you may have guessed by now, this is an illusion. The pit is actually only about 8' deep. Other than dispelling the effect (as 15th-level magic), the only way to di