MedievalWeaponInfo.com last week highlighted the medieval flanged mace (also sometimes known as the “morning star” or “spiked mace”): “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.”
You can buy one for your own home from TheCastleCourt.com for $119.