DracoSuave
First Post
The way I see it, there shouldn't have been a save involved, and here's why. Using Keep on the Shadowfell as an example (which, I'm assuming, you were playing), if I'm not mistaken, simply being being (or being pushed) in the same square as the Iron Maiden doesn't cause damage to anybody- when someone is in the Iron Maiden's square, someone else has to taken an action (minor, I believe) to close said Iron Maiden, thus dealing damage. In this case, the Iron Maiden's square is no more hindering than a square in the middle of the battlefield, because it doesn't deal damage until someone takes an action to deal damage to you.
Well using the rules for one Iron Maiden isn't the same for another... but it's a good way of looking at it.
To get the save:
1) The Iron Maiden has to be terrain.
That's pretty important. Is the Iron Maiden a terrain element, or is it a hazard or trap?
2) Does it punish movement or deal damage for being there?
If it doesn't do these things without extra interraction, i.e. closing the door, believe it or not, it's not hindering terrain, even if it IS terrain.
or
3) If it is not terrain, does it have 'can save' as a countermeasure?
If using the iron maiden is part of the encounter tho, like it seems, it's a trap, probably has a trap write up, and doesn't in any way represent a piece of terrain.