aye i know that you are talking about i found a secret entrance but once you get in there is no way out, luckily for me i found a mage that knew a teleport spell incase we get lost, it's a maze down there, you cant get into the library from my understanding but, in my entrance there are skeleton traps, and a giant pit filled with spiders, there are water falls that lead into "rooms" there is one room that leads into a vast chamber, it has demons in it, they dont move when i look at them, but they move when i avert my eyes from them, that room was where the mage and i had to leave, the demons. they, are quite hard to vanquish