Combat Dice are used by the players when is time to trigger Combat with another player. Each character has its own Combat dice that is unique with its own symbols and abilities. Even if you lose a Combat you can still earn something different like Action or Skill Points and so on. If a player want to trigger the Combat and roll his dice, he must first spend the equivalent Action Points, use a gun and be at the same map tile along with their target!
This set includes 6 different Combat Dice.
You can always check the base game on BGG here<%2