But she DOES screw over both parties. Say someone calls out to her for revenge. Well, she takes their soul for all eternity, and in return, she slays the person they want revenge on. If THAT person calls out for vengence, he either means against the person who sent her... and that guy is soulbound to her for eternity already. Or they want vengence on HER. In the later case, I'd assume she just flips them off and then kills them. Giving up your soul for eternity to be the food of a wraith is the punishment the people she "helps" get for being more concerned with revenge than just dying in peace. It's pretty cool, I think. The party she kills just kinda.... dies. Harsh, but not nearly as harsh as the eternity of hellish servitude to her in the shadow isles. Kalista PUNISHES desires for revenge. She just doesn't realize it because she herself is being punished for the same thing.