The first Expansion Pack for Valeria: Card Kingdoms brings in the King's Guard as Citizens that you can add to the center stacks during an Event in the game. The Event cards are also introduced. They have Exhausted backs and get shuffled in with regular Exhausted cards. When you exhaust a stack, there's a 50/50 chance that you'll encounter an Event. Most are good, but some are a bit bad.
For more information, visit the BGG listing.