Lords of the Seven Deadly Sins

Lords of the Seven Deadly Sins are a group of demon bosses from YGGDRASIL.

Background
In the Web Novel, at some point in the history of YGGDRASIL, there was once a World Champion of Muspelheim who managed to turned himself into one of the Seven Deadly Sins, a World-Class Enemy by using a World Item. Hence, his power grew into tremendous might to the point wherein which he could fought evenly against thirty players by himself. He would later get chased by players until destruction, and then utterly failed at the moment of his character deletion.

Strength
The Seven Deadly Sins, being one of the World-Class Enemies in the game. Even if thirty level 100 players, were fully prepared and forewarned of the battle ahead, did battle with one of these World-Class enemies, the outcome of the battle would still be in doubt.

Trivia

 * If one of these had appeared before them, it would be a threat to all of Nazarick.
 * Lords of the Seven Deadly Sins are possibly based on the Seven Deadly Sins.