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but again, being Bhaalspawn is way different from being the child of a God as Bhaal technically wasn't a 'god' at the time

My understanding is that Bhaal foresaw his death would occur *during* the Time of Troubles and walked the realms beforehand. Otherwise, Charname would be like 10 years old in BG1.

I think the children of different gods can certainly have different powers and such depending on the god, I just think it's weird lore wise to imply that the child of a god is an aasimar based on godly parentage alone.