Weapon/Armour Grades
Black Iron : Common Grade
Bronze : Uncommon Grade
Silver : Rare Grade
Gold : Epic Grade
Platinum : Unique Grade
Crystal : Mythical Grade
(Crystal grade weapons are very rare and only a few nobles and powerful adventurers can afford it.)
Mithril : Legendary Grade
(Mithril grade weapons can be counted on fingers and they are treated as national treasures by kingdoms and they can even go to war if a mithril grade weapon were to appear)
Orichalcum: Fantasy grade
(Although fantasy grade weapons exist in theory, many people believe they are just rumours as even the biggest kingdoms don't have a fantasy grade weapon. Only a few heroes in fairytales mentioned these weapons and is believed only the strongest can obtain one)