The Twisted Dungeon of Chaos [IC2]
You stand besides a solid steel door, with no indications of what is behind it, set into a stone face at the base of a cliff. Various rumours from towns in the nearby area - the ones who don't tell you to stay well away - suggest that this is an entrance to the Twisted Dungeon of Chaos, home to untold riches. Nobody knows what is actually inside though, since everybody who has previously entered has perished inside or been driven mad.
Closer inspection reveals faint markings engraved on the door. A circular symbol in the middle of the door, with the a flame to the left, a drop of water to the right, stones to the bottom and the wind to the top. There are no other markings on the door at all, nor any handle or indication of how to open it.