For mages:
Enter the library instance and once loaded turn around and blink through the instance. You are now on the other side of the instance. Go toward the long downward staircase you should see where the knooks used to be a open all.
Fall through and head Eastardly toward the graveyard side, you are on the bottom of the map thus areas on the map that are on that lvl are now open ......pretty much you can go straight to chests in the crypt or lowest areas of sm now.