nearly kills Harry

There was a flash, and a pair of white eyes formed in the glittering cloud of red points of light. They weren't pleasant. "Shall I show you the start of the path?" Bob's voice said. "Death, Dresden, is a part of you. It is woven into the fabric of your being. You are a collection of pieces, each of them dying and in turn being reborn and remade."
The white lights were cold. Not mountain-spring cold, either. Graveyard-mist cold. But I'd never seen anything quite like them before.
And there was no sense interrupting Bob when he was finally spilling some information.
Besides. Fascinating light.
"Dead flesh adorns you even now. Nails. Hair. You tend them and caress them like any other mortal. Your women decorate them. Entice with them. Death is not a thing to be feared, boy. She is a lover who waits to take you into her arms. You can feel her, if you know what her touch is like. Cold, slow, sweet."
He was right. A cold, tingling nonfeeling was glittering over my fingernails and my scalp. For a second I thought that it hurt, but then I realized that it was only a shivering sensation where that cold energy brushed close to the blood pulsing beneath my skin. It was where they met that it felt uncomfortable. Without the blood, the cold would be a pure, endless sweetness.
"Take a little of death inside, boy. And it will lead you to more. Open your mouth."
I did. I was staring at the light in any case, and it was amazing enough to merit a bit of gaping. I barely noticed a frozen mote of dark blue light, like the corpse of a tiny star, that appeared from one of the spirit's white eyes and began drifting toward my mouth. The cold sensation grew, and it hit my tongue like a thermonuclear peppermint, freezing hot, searingly bitter and sweet and-
-  and wrong. I spat it out, recoiling, throwing my arms up in front of my face. I fell to the floor, numbness spreading.
"Too late!" crowed the spirit. It shot into the air, swirling around over me, gloating. "Whatever you have done to my thoughts, the master will not be pleased that you have meddled with his servant."
The cold started spreading, and it wasn't purely physical. There was an empty, heartless void to it, a starless, frozen quality that raked at me- not just my body, but me-with a mindless hunger. And I could feel it sending tendrils out through me, slowing my heartbeat, making it impossible to breathe.
"Do you know how long I've been waiting for that?" the spirit purred, drifting back and forth over me. "Sitting there locked behind my own thoughts? Waiting for the chance to fight free? Finally, you thick-witted ogre, I get to leave your stupidity behind."
"Bob," I choked out. "This conversation is over."
The spirit's scarlet lights flared to sudden, incandescent rage and it screamed, a wailing sound that rattled my shelves and felt like it was splitting my head. Then the cloud was ripped backward across the room, sucked into the eyeholes of the skull as though down a hellish drain.
Once of the last of the motes went flickering back into the skull, the horrible cold faltered a little, and I curled up, focusing my will and trying to push it away. It took me a while, and that hideous void-presence lingered against my fingernails, even after I could feel my fingers again, but after a little while I was able to sit up.
After that I just curled up my knees against my chest, shocked and scared half out of my mind. I had always known that Bob was an incredibly valuable asset, and that no spirit with as much knowledge as he had could be weak. But I had not been at all prepared for the sheer power he had wielded, or for the malice with which he did it. Bob wasn't supposed to be a sleeping nightmare waiting to wake up. Bob was supposed to be my wisecracking porta-geek.
Good Lord, I couldn't remember the last time I'd confronted a demon with that much raw psychic power. If I'd been a second slower, or- stars and stones-if I hadn't remembered the condition that would banish Bob back to the skull and once again remove the dark memories, I'd be dead now. Or maybe dead and then some.
And it would have been my own stupid fault, too.


Dead Beat Chapter 3, Page 28-29