Rolemaster Settings Shadow World?

I am in a peculiar situation of putting together a ‘Shadow World special’ for the Rolemaster Fanzine and yet I know almost nothing about Shadow World. I know what I have read in the Players Guide and I know what I learned in the last campaign we played set in SW but I cannot trust what I learned in the game for two reasons. Firstly, the GM could have changed anything. Secondly we were playing The Curse of Kabis and it is my understanding that that particular adventure is non-cannon.