As they are used in combat, weapons will lose their sharpness and eventually become dull, giving the weapon a damage/armour pen debuff.
Introduction of grindstones, a way to make your weapons sharp and ready for combat once more.
There would be a very small chance to slightly buff your weapons stats past it's original max cap it had once it was forged, but also a very slight chance of completely breaking the weapon, players would be able to salvage some of the materials that were used forging the weapon by smelting the broken weapon.