Afterwards, Li Yu went to the stall area and purchased a large amount of sinking iron, leaving him with only two hundred Spirit Stones.
Sinking iron was the essence of iron ore, similar to the silver mud found in silver mines, and was characterized by its exceptional weight.
Similar to this was the sharp gold found in gold mines. When added during the forging of a spirit sword, sharp gold made the spirit sword even sharper.
Chapter 19