Two large Blizzard franchises, Warcraft and StarCraft, use a fog of war which only reveals terrain features and enemy units through a player's reconnaissance. Without a unit actively observing, previously revealed areas of the map are subject to a shroud through which only terrain is visible, but changes in enemy units or bases are not.[15] This is also common in both turn-based and real-time strategy games, such as the Close Combat series, Total War series, Age of Empires series, Red Alert series, Advance Wars series, Fire Emblem series and Sid Meier's Civilization series, Supreme Commander series .[citation needed]