http://www.gamebanshee.com/dungeonlo...rialelders.php
I assume we are talking about the end of the trial in room 9, correct?
The way to get out of here is via the left hand elevator (on your left as you enter the room). The elevator does not descend until you have finished killing all the spawning ghost from the 3 "plates" (one of which happens to be at the bottom of that elevator).. IF you are standing on any plate then not all of the ghosts will spawn - at least until after you have moved from the plate (..at which point those remaining ghosts will spawn).
Anyway..
Once you have killed all the spawning ghosts then both the left hand AND the right hand elevators will descend - and you will need to be off of either "elevator-bottom" spawn plate when they do descend.
Go first to the "right hand" elevator. Once you are standing on it it will ascend up to the room with the spirit bow. Get the bow and then take the elevator down again.
*NOW* take that "left hand" elevator up and out of the Elder Trials.
Of *KEY* Importance -
You can only take the right hand elevator ride once.. and though I'm not sure, it might well be this way for the important left hand exit elevator. So if you somehow activate one to where it ascends - you could be SOL (..and you'll need to reload to an earlier saved game).