summons Mab to Demonreach

While that drama was going on, I thought furiously. I thought about the mighty spirit who was my ally, who was being held immobile and impotent. I thought about the abilities of all of my allies, and how they might change the current situation if they weren’t all incapacitated. Molly was the only one at liberty, and she had worn herself out over the lake. She wouldn’t have much left in her—if she appeared now, the fae would defeat her handily. She couldn’t change this situation alone. Someone would have to set things into motion, give her some chaos to work with.
I just didn’t have much chaos left in me. I was bone-tired, and we needed a game changer. The mantle of the Winter Knight represented a source of power, true, but Maeve had damned near talked me into joining her team when I’d let it have free rein. I wasn’t going to help anyone if I let myself give in to my inner psycho-predator.
If we weren’t all inside the stupid circle, at least I could send out a message, a psychic warning. I was sure I could get it to my grandfather, to Elaine, and maybe to Warden Luccio. But while I was sure a mud coating could get us out of the circle, there was no way the fae would give us time to coat ourselves and do it. We were effectively trapped in the circle until sunrise, just like a being summoned from the Nevernev—
Wait a minute.
Circles could be used for several different things. They could be used to focus the energy of a spell, shielding it from other energies. They could be used to cut off energy flows, to contain or discorporate a native being of the Nevernever.
And if you were a mortal, a genuine native of the really real world, they could be used for one thing more: summoning.
The hilltop was one enormous circle: one enormous summoning circle.
“She is not here,” Maeve was ranting. “She sends her hand to deal with me? So be it. Let me send her a message in reply!” The little automatic swiveled toward my head.
I shouted as swiftly as I could, putting whatever will I had left into the shortest and most elemental summons there is: “Mab! Mab! Mab! I summon thee!”

Cold Days Chapter 51, Page 487-488


It’s impossible to know how something is going to arrive when you summon it.
Sometimes it’s huge and dramatic, like it was with Titania. Sometimes they come in a burst of thunder or flame. Once, this thing I’d summoned arrived in a shower of rotting meat, and it took me a month to get the smell out of my old lab. Less often, they simply appear, like a slide-show image suddenly projected on the wall, drama-free.
Mab came in a bell tone of sudden, awful, absolute silence.
There was a flash—not of light, but of sudden snow, of frost that abruptly blanketed everything on the hilltop and gathered thick on my eyelashes. I reached up a hand to flick the snowflakes out of my eyes, and when I lowered it, Mab was there, again in her crow black dress, with her midnight eyes and ebon hair, floating three feet off the ground. The frost was spreading from her, covering the hilltop, and the temperature dropped by twenty degrees.
In the same instant, everything on the hilltop ceased moving. There was no wind. There were no fitful drops of rain. Just pure, brittle, crystalline silence and a sudden bleak black presence that made me feel like hiding behind something, very quietly.
Mab’s dark, bleak gaze took in the hilltop at a glance, and stopped on Lily and her supporting coterie. Mab’s left eye twitched once. And she spoke in a low, dreadfully precise voice. “Cease. This. Rudeness. At once.”

Cold Days Chapter 52, Page 490