In Fabula Ultima, Villains are powerful antagonists that will give Player Characters a run for their money. Just as the Player Characters’ actions drive the story forward, Villains represent the powerful threats that loom over the world — sometimes lurking in the shadows, sometimes welcoming our protagonists with a warm and deceitful smile, and sometimes challenging them in an all-out battle that will decide the fate of the entire world.
Here are some good examples of Villains:
Whatever form they take, Villains are usually connected to one or more Player Characters; sometimes this connection is thematic (as would be the case with a ruthless Villain opposing a character's Theme of Mercy), but it can also be much more tangible (a classic case would be a Villain who is revealed to be a Player Character's lost sibling).
The Game Master may introduce Villains whenever they see fit — either by adding a completely new character to the story or by revealing that a preexisting character or creature is a Villain.
Villains are often accompanied by henchmen or even by other Villains: two lovers fighting side by side, a Queen and her advisor, a powerful sorcerer and his massive golems, a bandit leader and her gang of rogues... More information on how to create and manage Villains can be found in the Game Master chapter, on page 254.