Bloodthirstiness... The desire to kill someone... These strange concepts for some have always haunted people. And even if they are deprived of all technology, capabilities and knowledge, they will still look for an opportunity to kill and maim. At best, it will hurt. But they will never refuse the opportunity to shed someone else's blood. After all, even knowledge of numerous bloody wars in the past never stops them. It’s as if the memory of such horrors is simply erased... Who is powerful and very cruel. Who is conducting a terrible experiment on Humanity.