We know already that Sui Generis will feature different types of metals and material for weapons and armor, and that they will also differ in quality. What i wonder is whether we will see other types of metals and material, besides the traditional once such as iron and steel? I'm not expecting anything like mithril, but personally i think it would be cool if the world would feature some original and non-traditional metals and materials. Could result in even more variation for weapons and armors. Now i know this is a world of low fantasy, and it's definitively not essential as I'm sure they would be able to come up with enough variation in their weapons and armors without otherworldly metals and materials. But what do you guys think of it?