@Randomiser: Windows please.
@Excalibur: As Dikiyoba says, when you're teleported to the tower of magi.
@Ghaldring: I know, that's why I've given up so many times. But the beginning of chapter 4 is a nice clean place to start.
I'm played Avernum 2 many times but have never got round to completing it. Has anyone got a saved game at the beginning of chapter 4 so I can finally finish it (I don't fancy wading through chapters 1-3 all over again!). Thanks in advance.