As the sword-forging process gradually entered its final stages, Sun Dalian indeed sent a beam of light into the arena. The beam was as fine as a strand of hair, striking an inconspicuous spot on the blade in a single blow. After that, more fine threads flew out one after another, continuously locking onto every part of the blade! Looking closely, the colors of these threads varied, but generally shifted from light to dark.
Sun Datian and Sun Dakai could not help frowning at the sight of so many sword threads. Their surprise seemed tinged with solemnity. After all, I had handled countless swords myself, and the moment I saw the spots marked by those fine threads, I suddenly understood why their colors varied in depth.
These were the weaknesses of the half-finished sword. Each weakness would become the place where the sword was most likely to collapse, or the place an enemy was most likely to exploit. Marking these spots with those hair-thin lines was a clear way of telling the two elder brothers that these were all problems a sword tester would spot at a glance. As long as they were resolved, enemies would no longer be able to make an issue of them.
I also understood why the sword in Luo Han's hand, though seemingly decent, had been unable to withstand even a single strike from Sun Hanxi. This was precisely the ability of a sword tester: finding the most fragile points in a sword.
But I found it terrifying that Sun Dalian could locate so many points. There were three shades of gradually changing color, and I could not even see the lightest ones. If I forged a treasured sword myself, those invisible weaknesses might become the sword's only flaws. Against other immortals, it would be