silentspace said:
By the way, when I read the scenario, I didn't assume the lever opened the door. How come people think this?
There was nothing else in the room that looked like it could open the door.
Here's the original setup again
You’ve cleared out the dungeon and found the McGuffin you were seeking. Then you come to a room located in the back corner of the dungeon. In the room is only a large lever sticking up out of the floor. You search the room and find a secret door in one wall. You can’t find a way to open the door. The rogue searches the door and lever for traps, and finds none. The monk pulls the lever. He has to make a saving throw – he rolls a 19 on the die, adds in his mods, and fails the save. He turns into a pile of fine dust on the floor.
So the salient points are
1 - There's a lever in the room.
2 - A search of the room found a secret door, and no other possible means of opening it beyond the lever.
3 - A search of the door and the lever by a rogue for traps revealed no traps (we'll assume that the rogue took 20, and has search maxed out; competent trapfinding rogues do this; also note that the search skill, when used by characters with trapfinding, does reveal magic traps)
4 - Given no other way to open the door, the monk (who presumably has the best all-around saves in the party, and evasion) pulls the lever, and has to make a saving throw. He rolls a natural 19, and dies, turned into dust (i.e. can't be revived with anything short of Resurection, and possibly not without True Resurection).
It's not fair because it's an apparently undiscoverable trap (searching for traps revealed no traps) that's also an impossible-to-make save-or-die trap (monk failed by rolling a 19) on the only apparent means of opening a secret door (and adventurers will always try and open secret doors). The PCs took reasonable percautions; they had the rogue search for traps, and had the character most likely to make his saves pull the lever. And absolute best case, they're a high level party, so the cost (in time, money, and high level spell slots) to revive the dead monk is only expensive instead of crippling.