I only mentioned it briefly but enchantments are the equivalent to runes. When a weapon is enchanted it gains the attributes associated with the enchantment. A hammer with a fire enchant can cause an enemy to burst into flames upon being struck. Most enchantments are Elementalism based and so they have an active effect in battle. Other enchantments can be necromantic where after being slain with the weapon the weilder is healed slightly. Stuff of that nature but I'll let you get creative with it, just don't go overboard and make it OP as fawk.