Describe symbolism in Cirque Du Freak #7: Hunters of the Dusk: Book 7 in the Saga of Darren Shan by Darren Shan

The blood stone reprsents a connection between vampires.This stone allows a full-blooded Vampire to locate any Vampire in the world who has put his/her blood into the stone. Most Vampires come to the mountain at least once in order to place their blood in the Stone