The 5th secret document listed in the book is found at a small skull statue near Mo’grash stronghold. Upon finding this document, I was unable to pick it up. Unlike the other documents, it has no quest giver mark above it, and i can’t interact with it. I tried clearing my cache, interface, etc., but it didn’t work. I am not able to obtain the quest that follows collecting all of the scrolls, either (I have the other 5)