I haven't decided if I want to add some of my stuff to the Arillius stuff. My Gunslingers and things don't seem to fit the war-like environment of Ari. I think they could if I figured out how to wedge them in, but I don't feel like thinking that hard. lol.
I always imagined that the Ascher witches were created by being infused with demonic blood. They're not true demons, but they have demonic qualities and that's why their powers are limited to death and flesh. That and they were bred to be poisoned bait for vampires: blood so sweet it's impossible to resist it and powers that allow them to slaughter vampires with ease. I think that the Demos have tried to copy the idea, but have failed to pull it off in the same way. They have powerful witches on their side, but none can hold a candle to a true Ascher at the height of her power. I've got some history ideas in the back of my brain about a demon named Thanatos who used his blood to make them.
What am I thinking of doing with Jorja? I don't know. I was thinking that it was her ancestor that escaped Aryah by passing through the veil to the modern world and then hid away. I want to say that the slaughter of the witches was one of the turning points in the war. Aryah removed one of the more powerful weapons that the Merhites had which started the downward spiral toward sealing the gates. Jorja is a third generation Ascher with limited knowledge of her heritage, but she has an aptitude for her magic that is uncanny.
I think right now the only problem I have with things is that you're working in years/decades when these creatures are hundreds of years old. :P