The RoundTable Organization, The Anarchist Society and The 7 Deadly Sins.
The RoundTable Organization was formed by Arthur Pendragon and his knights; this "Organization" has been around since well the 0400's. The Organization has 3 simple duties; Protect the innocent, Defeat evil, and contain the unknown. It was first made public in 1945, although the world knows about the Organization, not all know what it is about. It is run by the 023 council, a shadowy group not even the highest ranking members know the identities of; they run everything from the dark and have strong connections to the political world even altering election results and campaign goals. They study the monsters and other creatures that roam free in the world. There is a different section for everything hunting, studying, advertising, management etc. it is the largest Organization in the world, yet no one knows that. When a threat grows uncontainable and unstoppable an elite task force is sent out, they are highly trained and ready for any threat, they are called "The 7 Heavenly Virtues". "In Hope and Virtue we trust" Is the motto all members must follow at all times. And yes before you ask, it was inspired by The SCP Foundation.
Just like how white has black, there is always an opposite side of the spectrum. The Anarchist Society, believe in one thing "Destruction", it was formed by Arthur Pendragon's archenemy and a rogue member of The Knights of The RoundTable. They are kept hidden from the public eye, but they have agents all over the world. It is unknown just how many members there are, but it is believed to be near the millions. "Anarchy and Freedom" reigns supreme in the minds of the members. Where there is virtue, sin is soon to follow… "The 7 Deadly Sins" embodiments of the sins of Wrath, Pride, Lust, Gluttony, Sloth, Envy and Greed. Although the Sins far predate The Anarchist Society, they soon joined forces with the Sins becoming a deadly and fierce force working for anyone who hired them. Eventually King Arthur would track them down, banishing them. The Sins take physical form, through the use of "Cardinal Hosts" those who have felt a strong connection to one of the sins. They take control of Cardinal Hosts through multiple ways, mostly by using "The blood of the Sins" a ritual which allows one of the Sins to take full control of the host. However some sins take a slower approach, slowly taking over the mind and body of the host. Only small remnants of the host remains after the Sin has taken control, silently judging the Sin forever haunting them.