"Why are you telling me this..." Voldemort's voice trembled slightly. "And what does it have to do with Harry Potter?"
"Just as I said earlier, the Cruciatus Curse evolved from the Killing Curse," Wizet said. "It was actually an attempt to reproduce, by some means, the Killing Curse's effect of reaping souls."
"If the Killing Curse is a sharp blade, capable of cleanly separating blood, body, and soul, then the Cruciatus Curse can only be considered some malformed weapon. It can only tear at the soul, with almost no cutting effect."
"Because the Killing Curse is clean enough, once the soul is separated from the blood and body, there isn't even time to feel pain before death arrives."
"The Cruciatus Curse is another matter. It can only tear the soul apart, and thus brings indescribable pain—the effect everyone knows so well."
"As for the connection between the Killing Curse and Harry, naturally, it was when you struck Harry with the Killing Curse all those years ago. Under Sacrificial Protection, the spell rebounded onto you."
"The Killing Curse still took effect. It tried to cut your soul away from your body, and because you had already made multiple Horcruxes, your soul was inherently extremely unstable. That was why such a peculiar situation occurred."
"Your soul was anchored by the Horcruxes and was not swept into the 'vortex representing death,' but it could not avoid being affected by that vortex, causing a fragment of your soul to split away."
"Because the Killing Curse took effect, the connection between your soul and body had already been forcibly shaken. In a sense, at that moment, you truly had stepped onto the edge of death."
"And that torn-off soul fragment could only attach itself to a suitable living creature nearby. Its target could only have