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I played without guides or hints and didn't know about this spoiler, so I was surprised.

I didn't read any guides either, but I came across the plot a long time ago in some magazine. Many years ago.

And besides, Planar Chaos isn't that popular, so a spoiler from it can't be compared to a spoiler from Star Wars.

Well, I meant that among fans of CRPGs, this is a fairly well-known fact, even for those who haven't played it.