Metallurgy (Storage Pit) is a technology available in the first series of Age of Empires and the Rise of Rome expandion. It increases Infantry and Cavalry attack by 3 points once 300 Food and 180 Gold is invested at the Storage Pit during the Iron Age. It is also required to upgrade the Heavy Cavalry to the Cataphract. Only a limited number of civilizations can research this upgrade. The Greeks are one of them that lacks the ability to develop this technology.