The Tenth Law-Ruler of the First Civilization Era and the Thousand-Man Law-Ruler in the main storyline were actually two groups that differed in their ways of thinking, patterns of action, and abilities in every respect.
The Thousand-Man Law-Ruler of the Previous Civilization differed greatly from that of the Current Civilization. First, the Previous Civilization's Thousand-Man Law-Ruler was unique in that they possessed the abilities of other Law-Rulers from the very beginning, though only in a very rudimentary form. The first nine Law-Rulers were all ultimate manifestations of some natural law.
The Current Civilization's Thousand-Man Law-Ruler, however, possessed its own unique abilities, and the powers they wielded manifested differently as well. The Thousand-Man Law-Ruler of the Previous Civilization tended to seize the powers of Divine Keys, while the Thousand-Man Law-Ruler of the Current Civilization preferred living Law-Rulers.
Second, their thinking and actions both bore the traits of their respective civilizations. The Previous Civilization seemed to have been a civilization centered on rationality, so the Thousand-Man Law-Ruler in the manga resembled a shadowy organization united in purpose, plotting before acting. The Current Civilization, having been tempered by humanism and left-wing thought, instead had a Thousand-Man Law-Ruler more like a loose, cunning band of thieves focused on sensory pleasures.
In the setting, the Tenth Law-Ruler of the First Civilization Era possessed the abilities of other Law-Rulers, but this was not explained in detail.
Because the Law-Ruler Cores of the Tenth Law-Ruler would be subdivided in this book, a Tenth Law-Ruler Core possessing the abilities of a particular Law-Ruler would be called a "Void Law-Ruler Core." For example, a Tenth Law-Ruler Core possessing part of the Herrscher of the Void's abilities would be called a "Void Law-Ruler Core."