Knights of Order run through several family lines, with there currently being about two dozen through out the world. They aren't super strong, but are tougher than normal humans. They can also surround themselves in mystical armor and call to themselves a ghostly sword. The sword is harmless to mortals, but very useful against the Forces of Chaos. The mystical armor and sword they can create looks unique to each Knight of Order. One Knight might have armor that looks like traditional medieval plate armor and another might summon armor that looks like it is made of ice. Most are trained from childhood how to use their abilities.
Forces of Chaos are things like Vampires, Werewolves, Demons and some Ghosts, along with other such beings. They seek to corrupt and destroy humans.