if you fall off anything in the DR you have to type /unstick twice and it should restart you in the place with the guardian.
I spent more time than I care to remember wandering around the bottom area looking for something to climb out with. .
If the DR is so dark you can\'t see and keep walking off things and falling, try adjusting your monitor brightness (this worked for me) or there may be a relighting trick. Search the forums for that one.
Good luck.