I have met some secret and it bugs me I can't find a way through it. I feela shamed since it is only the start :P. It is in the hall of the dead right at the start, you open an iron door, and there is a teleport high slightly to the left but if you make a step forward... You fall down follow a U shaped long corridor , then climb stair back up nearby... I have oracle spell on and don't see a way to reach the teleporter.