The world has seen plenty of serial killers who has killed people for plenty of reasons including satisfying their blood lust, witch-craft, etc. Let’s take a look at the top six most evil serial killers of all time!Gilles de Rais is a French noble man who is widely believed to be a forerunner of the modern age serial killer. Prior to embarking on a killing rampage, he served as a captain of the army of Joan of Arc, although it is very un-likely that she even knew about him. Rais was caught and convicted of raping, torturing, and murdering hundreds of young boys and children.Based on to survivor accounts, Gilles de Rais lured kids especially young boys, blue-eyed & blond-haired resembling his childhood appearance to his home and tortured, raped, and killed them, often masturbating on a dying victim. Gilles de Rais and his equally devilish accomplices will then line up the decapitated heads of the victims to decide the most beautiful among them.