If one has 10K corruption points, and chats with Thrundarr for the
first time, it crashes the game 100% of the time. It doesn't happen
if your first chat happens when you have <10K corruption points,
then go over 10k and chat again. That just causes Thrundarr to
give the messages about the PC having a funny accent. I've heard
rumors that it may have something to do with the 'unholy aura'
corruption, but I haven't noticed that.

Of course, I'm pretty sure that I am the only one who has ever run
afoul of this bug in, oh, nearly a decade, so it's not a priority.