Chou Jiukun was a Qi Drawing Realm martial artist, hence he knew many secrets of the Ancient Martial World that ordinary martial artists did not. Black Blade was precisely an extremely mysterious and brutal force within the Ancient Martial World.
The founder of Black Blade was a survivor who had escaped from one of The Four Great Noble Families that had been annihilated by the Flame Dragon Organization. Holding a grudge for the decimation of their sect by the Flame Dragon Organization, Black Blade had since its establishment gathered a large number of the surviving members from the factions eliminated by the Flame Dragon Organization.
Using these people's hatred for the Flame Dragon Organization, Black Blade formed a substantial underground power that opposed the Flame Dragon at every turn.