The use of maces in battle was quite common during the Middle Ages, as the weapon was quite inexpensive to produce. Many of the maces on display in museums today are highly decorated for this reason. Though a mace is just a type of club, the image of the spiked mace is what comes to mind for most people.
A deadly effective spiked mace is the flanged mace. The metal flanges, protruding edges of metal, allowed the wielder to pierce through even the thickest metal armor. In 12th century Kievan Russia the Pernach was developed. It featured six flanges and became popular across Europe for its ability to pierce plate armor and chainmail.