You were missing some discs?  Interestingly enough, it seems that the discs of Norgannon are only parts of the complete set - like keys on a key ring, if you will.$B$BIf we can find the Plates of Uldum, then we could actually access the Uldum complex itself!  Imagine actually exploring the place where the Creators worked without having to bring a huge shovel!$B$BNot that there's anything wrong with shovels... or digging...