I might be wrong, but from what I remember, Halsin felt responsible for Thorm's fall.
If I remember exactly, it was mentioned in the older patches that Halsin killed Thorm's daughter.
I also remember that at some point they removed this entry, but I won't give a head for it
Thorm's daughter was probably Isobel. I also practically sure that Larian changed the roles of this character several times.
If Moonhavean was destroyed more than 120 years ago, it doesn't make sense for Shadowheart to have a connection to this place (she certainly doesn't look like someone who is around 130 even for a half-elf)
Unless she died, was the Unclaimed, and got resurrected.
You know, that could be why she's wearing Dark Justiciar-like armor in the beginning. If she was wearing it when she died, and just recently got resurrected...
As for the General being Thorm, there is a defaced statue of Shar in Grymforge. Someone defaced it with the symbol of the Absolute. It implies Shar and the Absolute are not allies. So the General is likely not a Paladin of Shar like Thorm. I mean, like Minthara, he could have turned from Shar, but I doubt it.
Thorm, if I remember correctly, died during the conflict with Roa 120 years in the past. He could be resurrected, of course, like my theory about SH, but it didn't seem like that to me.
