After removing the impurities, it was time for casting.
Casting meant to mold the molten iron into the shape of the targeted item. For example, if Su Mo wanted to craft a sword, then he should cast the molten iron into the shape of a sword.
In this stage, if crafting a Lv 1 or 2 weapon, one would need to put the molten iron into a sword mold and wait for it to cool down and take shape.
However, for Lv 4 weapons or for those skilled craftsmen, they only needed to cast by using their willpower.
Willpower could complete the three major stages of crafting—casting, forging, and sharpening.
Su Mo took out a piece of Floating-cloud Marble and put it into the furnace.
It started to melt immediately after.
The Floating-cloud Marble could neutralize the Dark Steel and the Silver-essence Sand. It acted as a stabilizer and could increase the weapon's ductility.