How the Hell could Magus's mental state transfer to Schala? Schala seems to have alot of mental power, this is proved in how long it took for the DoT to even try to absorb her, which still didn't happen for like what? 10000 years?.
Also, I don't remember Magus' castle being destroyed. In 1000AD, the castle is there, but it has like a moat around it so you cant get into it. It was probably abandoned and run down after Magus "dissapeared".