nerve burning

I stared down for a second. I didn't want to kill the ghoul. That wasn't nearly enough to cover the debt of its sins. I wanted to rip it to pieces. I wanted to eat its heart. I wanted to pin it to the floor and push my thumbs through its beady eyes and all the way into its brain. I wanted to tear it apart with my fingernails and my teeth, and spit mouthfuls of its own pustuled flesh into its face as it died in slow and terrible agony.
The quality of mercy was not Harry.
I called up the Hellfire again, and with a snarl cast out the simple spell I use to light candles. Backed by Hellfire, directed by my fury, it lashed out at the ghoul, plunged beneath its skin, and there it set fat and nerves and sinews alight. They burned, burned using the ghoul for tallow, and the thing went mad with the pain.
I reached down to the ghoul, caught him by the remains of his robes, and hauled him up to my eye level, ignoring the little runnels of flame that occasionally licked up from the inferno beneath the ghoul's skin. I stared into its face. Then forced it to look at the bodies. Then I turned it back to me, and my voice came out in a snarl so inhuman that I barely understood it myself.
"Never," I told it. "Never again."
Then I threw it down the shaft.
It burst into open flame a second later, the rush of its fall feeding the fires in its flesh. I watched it plummet, heard it wailing in terror and pain. Then, far below, it struck something. The flame flowered and brightened for a second. Then it began to slowly die away. I couldn't make out any details of the ghoul, but nothing moved.


White Night, Chapter 23, Page 232