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Explanation I read on reddit - seems fake? [SPoiler- don't come in if you haven't played bg1 + bg2]
One guy asks on reddit: So Gorion knows that Imoen is also bhaalspawn, yet chooses to leave her in candlekeep.
Does he think that her heritage is still a well kept secret? Or does he leave her to die to assassins blades because she is so annoying?
And there is one answer:
There's two subgroups among the Bhaalspawn, there were those like the PC, Seravok, and the 5 who were born to clerics of Bhaal in his temples and the other type which are like reincarnations of Bhaal's scattered remaining essence, babies who had yet to be born at the time of Bhaal's death. The Bhaal taint isn't as strong in the latter group because they have less of it and because they weren't "blessed/baptized" by Bhaal's clerics shortly after birth.
I've long assumed that Imoen was in the latter group, and speculate that Gorion thought Imoen might be a Bhaalspawn but had no way of knowing for certain.
Where did the guy read these things? Are they confirmed?