The imperial upgrade is a upgrade for almost every type of unit, the exceptions being archaic units such as Crossbowmen, which can only be upgraded to Veteran level. The imperial upgrade is a powerful upgrade and can only be bought by players with robust economies due to its high cost of 1500 wood and 1500 coin.


While the imperial upgrade is expensive it is usually worth it, as the units upgraded receive a 50% increase in hitpoints and damage dealt.