hmm...
Sounds like a good start, actually. But you need some justification. What exactly is the Chaos connection? To what extent was the Seer corrupted? Most importantly, at what point? I mean, if she was corrupted in the Eye you have problems with her just becoming a nameless daemon. But who was she fighting for the soulstone? If she was taking it from a Chaos force, they could have begun to influence her. It would make her overreaction more understandable and would also explain her affinity for Chaos artifacts. Long slippery slope and all that.
Sounds like a good start, actually. But you need some justification. What exactly is the Chaos connection? To what extent was the Seer corrupted? Most importantly, at what point? I mean, if she was corrupted in the Eye you have problems with her just becoming a nameless daemon. But who was she fighting for the soulstone? If she was taking it from a Chaos force, they could have begun to influence her. It would make her overreaction more understandable and would also explain her affinity for Chaos artifacts. Long slippery slope and all that.