No. We used only tiny bits. When the addon was cancelled, we couldN't use much - we had to start from scratch.
Oh, yes, and there were the 4 Frineds of the Hero, which were supposed to have a secret meeting later in the game which never occured becauce we had no more time. Other than that (an a coouple of bugs) I'm quite satisfied with our first work.
About the development cost. Gothic 1 cost several millions and brought back only a few of them. With Gothic 2 we got that money back and achieved our break-even. With the addon, we actually started to make a bit of money.
The Magic barrier was created by 12 magicians, Xardas being one of them! When Xardas left the old camp, there were only 5 Mages left.. So they took Milten as an apprentice, when he was thrown into the prison after the barrier had been created. There is a dialogue in the game where one of the mages gets the numbers wrong. I think it was Saturas… I noticed that error, fixed it and some ex-team member of mine "fixed" it back because he didn't understand the background. There is no missing mage. The guy just messed it up