As far as I'm concerned, it's never full, but Vor may have something to say on that.
Onwards to something fun. In-universe organizations! :D These are but some of the organizations that either are or have been active in the setting.
Do note that while your characters are not required to be part of an organization, they are free to be, just don't automatically expect to start off high-ranking.
The Shadowgale Clan: Named for the late leader of Jenovah, who was slain by vampires, Samira Shadowgale, the Shadowgale clan is a mercenary clan built of elite undead hunters. Anyone is free to join, regardless of past, but the rules will be strictly enforced. The dark elf Shadowgale is the leader of the clan, which is currently very small in number (being Shadowgale) due to its status as a new organization. Has no designated headquarters to avoid the fate of Sapphire Phoenix Guild.
The Mekhanism Institution: Iconic for their creation of the Automatonic Golems, the Mekhanism Institution is a guild of sorts behind much of Niverin's magical tech, from the aforementioned Automationic Golems to the quintessential manabolt pistol. Mekhanism facilities, such as the primary campus in Southvale, are a mixture of mad science lab, production facilities, and university. Their public face is their crown creation, the one-of-a-kind humonculus Mira Ackov, who leads their test and field teams.
The Sapphire Phoenix Guild: A former elite mercenary guild, the predecessor of sorts to the Shadowgale Clan. The guild was extremely active and well known up until its horrific demise several decades ago, the infamous Phoenix Massacre. The entire guild, on the night of one of one of the scheduled mass meetings that required everyone to attend, was slaughtered down to the last man by the forces of the central Vampire King, Vormatz the Dreaded. Even to this day, the date is chilling reminder of the fates of those who incur Vormatz's rage. The ruins of their once-great fortress still stand upon the Heroes Plain, decrepit and blighted. Even now, little life touches the remains of the place, as if the blood spilled turned the very land barren. There are no known survivors.
Niverin Guardians: The elite of the elite. Considered to be the greatest living soldiers in the land, they report directly to Paladin King Ardm Ore himself, as well as having overriding command over anyone save the ruler of Niverin's many countries, should the need arise. They handle the missions deemed too dangerous for anyone else, and are known for actually succeeding. One does not apply to the Guardians, one is chosen by the Guardians themselves. Ardm Ore is more-or-less the de facto leader of them, and can fight with the best of his troops.
As well as various traditional guilds, such as the Ranger and Fighter guilds, also the army. Again, you ain't starting high up unless you can CONVINCE us with your character and ability to PLAY them.
Have an idea for an organization, let us know, it may just make it!