I'm doing the two quests together in Darkmoor castle: the "Destroy the book of liches" and get the "Memory crystal delta" quest, might as well do it at the same time. I'd rather get them both over with, than have to come back later and face this again. This is the area that you access after turning the ceiling cube red in the first part of the castle. After turning the cube red in the first part of the castle I went around to the back (nw) hall and into a new area, which had opened up and appeared to be a courtyard where there were a lot of eyes.
I killed the eyes and wandered around until I found an entrance. This led to a hallway which led into a large room filled with eyes and liches. After killing them all I wandered around a bit upstairs but found nothing interesting.
After checking some online help I discovered that I had to go around the left of the castle and up a ramp to a secret door to access the rest of the castle where the two items were that I needed. I went back out the entrance and around the side killing eyes until I found some trash heaps. Further down were more eyes and then I found the ramp. Went up the ramp, opened the secret door, went down the hall until I found this room that can only be seen through an opening in the wall. It's so full of liches, that no matter where I jump down I can't escape. There are so many of them that I'm taken out before I can walk forward. I've tried to figure out where I could strategically go to pick them off slowly, but there doesn't appear to be a place.
Is there something I need to do in the first room of eyes/liches that will open up another way?
It appears that jumping through the window down into the room is the only way to gain access to the items I need. We're level 40, so I would think we could handle this. I can deal with monsters but not when I'm right in the midst of them. So I'm thinking there must be another way to get there where I can pick them off slowly.