Bloodthirstiness… The desire to kill someone… These strange, for some people, concepts have always haunted people. And even if you strip them of all technologies, opportunities, and knowledge, they will still search for ways to kill and maim. At best—only to wound. But they will never give up the chance to spill someone else’s blood. Even the knowledge of many bloody wars in the past never stops them. It’s as if memory of such horrors simply wipes itself… Someone—mighty and very cruel. Someone who is conducting a terrible experiment on Mankind.