Gray Iron

Gray Iron is a less abundant, naturally occurring form of Iron that is used by Humans  to craft weaponry and armor. Gray Iron is both more expensive and more durable than basic Iron, although it is less valuable than steel. When tempered, Gray Iron becomes what is known as "White Steel," which is the most expensive and durable crafting metal used by Humans. Although both Gray Iron and basic Iron are indeed gray in color, Gray Iron is named as it is because of its slightly lighter, paler coloration.