The quest "Den of Evil Perversions" is broken in Onyx. It is supposed to be a group quest, according to the description, yet the entrance door will only allow ONE person in.
Please fix this as several people I know need this quest.
Which brings up another couple of broken doors in Onyx - the portal at the bottom shows useable, but does nothing. Also, there is a "Stygian Door" on one of the upper levels that shows as an exit point on the map, yet fails to do anything.