Well...
The young sorceress had seen her daughter die at the hands of a Night Hag, she saw how the girl's soul was harvested while young Melissa was unable to move, stiched to her own bead by the Hag's foul magic. She might have been unable to move, but her eyes betrayed her terror, and more horrible it was then as her soul abandoned the shell and left those bright green eyes of a dusty gray.
Her wrath was terrible, she knew it was from a diabolist, those able to have the fiends to their bidding. But she didn't know who.
Her ire lashed out at everyone in the region who dabbled in arcane lore, they died by the dozen. The process shattered something inside her, some say it was her sanity, some say it was her heart.
When there was noone else left she kept looking for her daughter's soul, even her husband fell under the spells once he told her to just leave it and carry on, two years after the happening.
She had failed to search somewhere, those harnessing the arcane aren't the only ones in contact with fiends. The Priest of the town, an elderly man, kind with the less fortunate, he delivered them of their suffering, he delivered their souls to a Night Hag. Night Hag who was in need of a young soul with arcane power for one of her experiments. Night Hag who was pointed at the sorceress' home.
He wasn't the only one the Hag frequented to harvest souls, he told the sorceress so...
"She *cough* melded her essence *wheez* with your daughter's, there is your daughter, now let m..." The shrine was obliterated, but the sorceress remained there for days and days in meditation. Then she left.
She discovered a way to make herself completly immune to the Hag's powers, not even bypassable by great arcanists or fiends, she would never need to sleep, and any mental intrusion would be blocked by negative enery... and even better, she could carry on with her search of those who deliver souls to the hag, for eternity if it was necessary. But the mad passion for vengance remained in her young dead husk, to this time all those she has found she has been unable to question, she kills them at sight.
See also post #10