"Southern Bright Glazed Fire Sword" was the name of the flying sword produced by this sword-refining method.
According to the half-volume Sword Canon, this flying sword was not the most difficult of the several Life-Bound Flying Swords to refine. In some respects, its refining method was even relatively simple.
Any fire-aspected spirit materials of the second tier or higher could be used to make it, whether crystal stone, spirit iron, spirit wood, or even beast bone from fire-aspected demon beasts.
The only requirement was that these materials had to be meticulously refined beforehand until they were pure, without the slightest trace of impurities of any other element. Otherwise, the refinement would certainly fail.
As a second-tier artifact refiner, Wang Yu naturally had some confidence in his ability to refine and purify materials. For ordinary sword cultivators who were not artifact refiners, however, this requirement alone would likely stump eight or nine out of ten.
The crucial point was that the sword cultivator had to process the Southern Bright Glazed Fire Sword's materials entirely alone, with no second person present. If the materials picked up another person's aura during processing, the subsequent fusion with the spirit soul would likewise fail, leaving only an ordinary Sword Weapon rather than a Life-Bound Flying Sword.
According to the Jade Slip, this was also one of the greatest differences between a Life-Bound Flying Sword and the ordinary Life-Bound Magical Artifacts used by other cultivators.
Although ordinary cultivators also fused their spirit souls into their Magical Artifacts, their Life-Bound Magical Artifacts were made by artifact refiners, and only a thread of their spirit soul was incorporated into them.
Sword cultivators, by contrast, carried out the entire process alone to ensure the purity of their Life-Bound Flying Swords and prevent contamination by another person's spirit soul aura.