lash knows outsiders

Lasciel squared her shoulders and straightened. "You're right," she said. "It is my choice. Listen to me." She leaned closer, her eyes intent. "Vittorio has been given power. That is how he can do this. He is possessed."
I wished I could have raised my eyebrows. Possessed by what?
"An Outsider," Lasciel said. "I have felt such a presence before. This attack is drawn directly from the mind of the Outsider."
Gosh, that was interesting. Not relevant, but interesting.
"It is relevant," Lasciel said, "because of the circumstances of your birth - because of why you were born, Harry. Your mother found the strength to escape Lord Raith for a reason."
What the hell was she talking about?
Thud-thump : 1:26.
"There was a complex confluence of events, of energies, of circumstances that would have given a child born under them the potential to wield power over Outsiders."
Which didn't make any sense. Outsiders were all but immune to magic. It took power garnered only from centuries of study and practice, wielded by the most powerful wizards on the planet, even to slow them down.
"Strange, then, don't you think, that you defeated one when you were sixteen years old?"
What? Since when? The only serious victory I'd had over a spiritual entity when I was that young had been when my old master had sent an assassin demon after me. It hadn't turned out the way DuMorne had been hoping.
Lasciel leaned closer. "He Who Walks Behind is an Outsider, Harry. A terrible creature, the most potent of the Walkers, a powerful knight among their ruling entities. But when he came for you, you overthrew him."
True. I had. It was all still a little blurry, but I remembered the end of the fight well enough. Lots and lots of kaboom, and then no more demon. And there was a burning building.
Thud-thump : 1:25.
"Listen," Lasciel said, giving my head a little shake. "You have the potential to hold great power over them. You may be able to escape the power now held over you. If you are sure it is what you want, I can give you an opportunity to defy Malvora's sending. But you'll have to hurry. I don't know how long it will take to throw it off, and they are almost upon you."
After which, we were going to have a long talk about my mother and these Outsiders and their relation to the Black Court and exactly what the hell was going on.
Lasciel - Lash, rather - nodded once and said, "I will tell you all that I can, Harry."


White Night Chapter 41, Page 442-445