Souverainete isn't just a plugin. It's a global server-side modification that changes one of the game's most important mechanics: villagers. Vanilla villagers are broken: they allow you to get endgame items for a single emerald. Players use them to build prisons called trading halls. They can't even fight or defend themselves from zombies! And this isn't the player's fault: the game developers programmed the villagers to be mindless vending machines.
Souverainete attempts to fix this with style: races, quests, settlements, smart fights, names, personalities, and much more...