Thieves used to wander around the dark streets of slums and they were the ones who loved hat they do. However, the crisis of the world would not let them to continue with their comfortable life anymore, and they realized that they have to come forth to resolve the predicament. Thieves have formed an organization called Guild, and it began to prove its ability as information organization. They are so used to ambushing and sneaky attack that they have never fought a straight battle. Especially, Thieves are the special forces who are matchless in urban guerrilla battle. They know about city and the buildings so well and they have mastered the city battle tactics. There are so few ho could capture them in city.
As the superior classes of Thieves, Assassins have crawled deeper into the darkness. They are geniuses of infiltration and self-secretion thanks to their ability to assimilate themselves to the darkness. Assassins use poison to attack multiple targets with the least amount of effort. They have chosen to use a wholly different type of weapon called Katar, and the use of it matched with their active and practical characteristics. As their belief, "To live, no action is cowardly," their priority us to survive not to defeat the monsters. Achieving their object despite that is the element that had upgraded their fame and threat.