Vampires - The Stone

"The Stone serves several purposes," he said. "Every vampire, when accepted into the fold, must stand before the Stone and place his hands on it. The Stone looks as smooth as a ball of glass, but is ultra-sharp to the touch. It draws blood, which is absorbed by the Stone — hence its name — linking the vampire to the mental collective of the clan forever."

"Mental collective?" I repeated, wishing for the millionth time since I'd met Mr. Crepsley that he'd use simple words.

"You know how vampires can mentally search for those they have bonded with?"

"Yes."

"Well, using the method of triangulation, we can also search for and find those we have not bonded with, via the Stone."

"Triangu — what? " I groaned, exasperated.

"Let us say you are a full vampire whose blood has been absorbed by the Stone," he said. "When a vampire gives his blood, he also gives his name, by which the Stone and other vampires will thenceforth recognize him. If I want to search for you after you have been blooded, I merely place my hands on the Stone of Blood and think your name. Within seconds the Stone allows me to pinpoint your exact location anywhere on Earth."

"You could do this even if I didn't want to be found?" I asked.

"Yes. But pinpointing your location would be no good — by the time I got to where you had been when I made the search, you would have moved on. Hence the need for triangulation, which simply means three people are involved. If I wanted to find you, I could contact someone I was bonded with — Gavner, for instance — and mentally transmit your whereabouts to him. With me guiding him via the Stone of Blood, he could track you down."

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Cirque Du Freak: Vampire Mountain, Chapter 18