The Four Slaughter Clans are divided into four branches: the Slaughter-Demise Clan, the Rune-Slaughter Clan, the Prison-Slaughter Clan, and the Rite-Slaughter Clan.
Su Chen had no way of knowing which clan Luo Yinhuang actually came from.
"Luo Yinhuang is from the Slaughter-Demise Clan."
Chapter 769