8. Hashashin or Assassins
If you have ever heard of the popular game franchise Assassins Creed, or even played it, chances are you already know plenty about this mysterious order of assassins, originally called Nizari Ismailis. Like many other sects, the Assassins’ origins were in the Crusades era, an Islamic sect of fighters that clashed against invading Christian forces. Many of its original records have unfortunately been destroyed by Mongols during the 13th century, following the defeat of their main headquarters Alamut. Though it is known the Order of Assassins were stealthy fighters, whose methods of attack were through assassinations of prominent adversaries in the form of assignments, causing great fear and intimidation to their enemies.