The first thing the players are liable to notice in this room is the crank. It’s large, with a bit of rope wrapped around it. The end of the rope disappears into a hole in the floor. If the players choose to look around, they’ll discover a fairly obvious trap door. It’s much too small for a human, or even a halfling, to fit through, and there is no easy means of opening it. (Though a bit of prying will yield results).
If the players are able to screw up their courage to fiddle with the mysterious crank, and turn it, it will pull more rope out of the ground. Simultaneously, a ladder will begin to rise from beneath the trap door. The ladder is made of wood, and wobbles a little, but will not break unless put through undue stress.
The crank can be turned until the top rung of the ladder reaches a height of 200 ft–just high enough for it to be equal with a small alcove high on the wall which leads to other areas of the dungeon.
Unfortunately, while this alcove is normally open, turning the crank below causes a heavy sliding door to descend from the ceiling. This door has no handholds, and is flush with the walls around it. Players on the top rung of the ladder will find no purchase for a grappling hook. And lifting the 300lb door while standing on the top rung of the ladder would be a feat of exceptional difficulty.
The door and the ladder move relative to one another, so that the door is not completely open until the ladder is all of the way down, and it is not all the way closed until the ladder is extended to it’s maximum height. The door, however, is only 6ft tall. So when the ladder is at half-height (100ft), the door will only be open 3ft; when the ladder is at three-quarters height (150ft), the door will only be open 1.5ft; etc.
I’m curious to experiment with this room. It clearly works best as a low level challenge, since high level characters will have access to spells and ability which will make overcoming this room child’s play. However, I honestly can’t think of a good way for 1st or 2nd level characters to overcome this challenge.
Anybody have any ideas?