Being a Grade 6 Alchemist and a Grade 7 Alchemist are two entirely different realms—it can be said to be a qualitative change.
Although Grade 6 Alchemists were rare, there were always a few around. However, there were only five Grade 7 Alchemists in the entire Southern Continent.
When the people from those major sects realized that Lin Chuan and Gan Feng were very likely Grade 7 Alchemists, they could no longer sit still.
Chapter 640