"Wormtail: Bone of the father, unwillingly given. (puts the Riddle bone in the cauldron) Flesh of the servant... willingly sacrificed. (screams in agony as he cuts off his own hand with a knife) Blood of the enemy... (uses the same knife to cut Harry's sleeve open and draws blood from his arm as Harry screams painfully) forcibly taken. The Dark Lord shall rise again. (adds Harry's blood to the cauldron)"