I basically followed the approach of the original booklet: the orb being the reason therefor Norek wasn?t devasted in the Wars of Dominion. But nobody is aware of the orb even existing.
By the way, you should also make your mind up with the Wall?s of Norek. Being mile over miles long, with only 700 defenders - that?s at least questionable.
For the Nore - in my setting they are living very secluded. Because of the history, the Nore killing all non-nores in the city at some point in the past. so when lorgalis first starts to move, he (or say Nitire) kills the elvish ambassador, isolating norek. and next he is starting racial prejudices on both sides, the nore vs the "normal" humans and vice versa. leaves Norek in a very weakend position.