Some of the best game mechanics in gaming are tied to simple premises - such as Age of Empires taking factions across stages, or StarCraft and Command & Conquer making their units more dynamic by giving them faction-wide properties. In the case of Fire Emblem, it was the Weapon Triangle - essentially classifying units under categories that defeat each other, much like rock-paper-scissors. The straightforwardness of this mechanic made Fire Emblem even more recognizable because of it, and other tactical RPGs formed their own derivatives of the concept.