@VarionusNW
You are totally misunderstanding me. You see, according to our OC, there was a time before the Society began. During it's creation and establishment, and probably for a short while afterward, they certainly would have had opposition. ie. to deal with vampires who refused to accept the Society. There would have been wars, other factions, rebel lords, etc. who they had to defeat in order to become the single governing establishment among vampire kind. This all occurred hundreds of years before the current setting. Am I right about this?
So, I assumed that Aldaric could be from one of the Society's enemy groups. His group believed that massacre, etc. was a vampire's right as the superior species, and so they fought a battle with the Society vampires at some point.
Clearly the Society vampires won and that is why there are no enemy vampire groups left. All that is left is the society. Is this right?
The society started as what was essentially a doctrine. Vampires followed it of their own will. These ideas were spread across Europe and Asia, but they were never really forced on anybody. Sure, there would be people who disliked the idea of Society, but it wasn't a mandatory set of ideas, and they weren't even laws. At that time, it was simply a list of restrictions that people maintained on their own. It became popular because it helped to reduce the number of active hunters, which used to be relatively high.
If a group of Vampires believed that they had the right to massacre humans, they would be more likely to be killed by hunters, not followers of Society. So, The Society grew because it reduced the threat of hunters, and those who would appose society became the largest targets for hunters. By the 1400s, The Society's followers wanted a centralized government, and any detractors were the minority. Any detractors were still more likely to be killed by zealous vigilantes and hunters than anyone working under the power of Octus and The Society. If they did get killed by member of Society, it would be due to those laws being broken. Just having a different view wasn't an issue, but breaking the laws of The Society would of course be the issue.
Society wouldn't have fought any battles. It would just have beat out any other ideas, as it was the most favorable.