YAH! Found it! I don't know how I missed that protruding brick in the northwest corner of the library the last 100 times I was there... did it appear when I walked the runes?
How do I get dispel barrier to level 3? I've been all through Koth's lair and tried to read every book in there. All my characters are above level 31 and I definitely have Dispel Barrier at level 2 for all characters. How can I get this spell to level 3? The hintbook doesn't say anything about it.
The king spider wouldn't offer me any quests, so I just killed them all. Got into the egg chamber, but alas, no eggs. Oh well.
Can anyone tell me how to get through the barrier at Tenevra?