The Book of Strange Things
I have heard that there are strange things in the world, and their quality is extraordinary. The "Chemical Formula Hf" is the most important. This material quality is unique, and it is very tough. It is like a strong tool, which can withstand the power of ten thousand kingdoms without breaking.

Its shape is also wonderful, hidden in various things, and it is often difficult to detect its true appearance. In case of fire, it will not melt, and it will not rust through wind and rain. It seems to have a consonance, keeping its true nature.

The skilled craftsman of ancient times, occasionally obtained this thing, like a treasure. With the casting tool, the tool is strong and powerful, and can break gold and stone; with the armor, the armor is solid and light, and can resist strong enemies.

However, this thing is rare and difficult to find. Or hidden in the belly of the mountains, or hidden in the abyss of the sea. Those who want to get it must go through thousands of hardships and experience all kinds of grinding before they have a chance.

Although the years pass, the wonder of this thing is still passed down by the world. Those who come after should follow the holy will and study the material nature in order to develop their abilities and add brilliance to the world.