 Players may trade resources and gold for any agreed-upon price - however all trades must involve the player who is trading and building.Players may use their resources to buy development cards (which may be played any time after purchase, with each card granting different effects) or augment their two tribes by adding warriors, horsemen, or supply wagons.After trading and building is completed by all players, players may take action with their horseman tribe, and after each player has taken action, do the same with their warrior tribe.