What is the Blood Sect?

If you ask people what kind of organization the Blood Sect is, you'll get many answers:

“They’re creatures wearing human skins.”

“Vile scum at the edge of humanity.”

“They’re bastards who take pleasure in killing, massacring, plundering, raping, torturing, and destroying everything.” (Though, if you leave out the rape part, it might remind you of someone.)

However, not all members of the Blood Sect are like Sir Seomun or Lady Cheong, who enjoy cutting down people for the sheer thrill of it. Of course, the higher up you go in the hierarchy, the more common …