I'm stuck. Managed to get past the first platform with four teleport pads, and after that, it doesn't matter which teleport pads I walk to, I get dumped right outside the entrance area, over and over.
At this point I think maybe there's something else that I missed, and I tried to walk in the area with dark magic spells up - shadow cloak, dark vision, whispering of shadows etc, but I found no levers or any interactive spots. Did I miss something or messed up a step that couldn't be reversed?
Any tips or experience would be much appreciated!