Managing Villain Rosters Across a Five-Year Campaign
A five-year campaign accumulates antagonists the way a long campaign accumulates NPCs — gradually, until you look up and realize you're managing a roster of eleven villains at various stages of their own plans, and you can't remember half of their motivations without digging through session notes. Villain roster management is one of the craft skills that separates good long campaigns from great ones, and it requires a different system than most DMs build for heroes.