The Blood Killing Sect is a sect that consumes Life Essence as a price to pursue power. Its cultivation methods continuously strengthen the bodies of martial artists and also make their Divine Souls become more powerful.
Such a sect was considered unique on the Jiuzhou Continent, but Duan Gujin had little impression of the Blood Killing Sect.
This was because, although he had entered the Jiuzhou Continent in his previous life, he hadn't had any dealings with the Blood Killing Sect at that time and didn't know much about it.
Therefore, he understood the Blood Killing Sect by thoroughly reading the classics of the Outer Disciples.
In Jiuzhou Continent, the Blood Killing Sect wasn't a first-class sect; to some extent, it could only be considered a second-class sect.
It was regarded as a second-class sect because it required the consumption of martial artists' Life Essence.