In Star Wars, the Sith have a Rule of Two which states that there must be two siths, no more, no less. Basically, it's flexible because it's survival of the strongest so they have to try and kill each other and make themselves stronger and stronger as the generations go on. Simple, right? Well, in the Destiny lore, there is quite a similar rule, the Sword Logic. That is also 'survival of the strongest' with swords, so like lightsabers, AND THEY ARE USED BY THE DARKNESS, THERE ARE TWO HIVE LORDS LIKE TWO SITHS, AND THE DARKNESS IS LIKE THE DARK SIDE BECAUSE THEY USE THE DARK SIDE OF THE FORCE. *sigh* I'm ashamed....
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No, Rule of Two made reference that a Sith Lord could only have one and only one apprentice/partner, so yeah Siths always travel in teams of 2, work in teams of 2. And only cause the nature of the dark side and the sith delusions of grandeur the apprentice always aims to kill the master. While sword logic, is something like if A is under B, but A is capable of killing B, then A is stronger than B, by challenging themselves, Oryx and her/is sisters, they "sharpen" themselves. A is stronger than B, then B challenges A and wins, B is now stronger. They keep going till they are to OP that even Bungie can't nerf em