This Article is based on the Official Translations of the Light Novel series! The information and terminology in the article will be based on the source material rather than the Donghua (Anime) or Manhua.
The 8 Ancient Clans are 8 clans from the ancient times in the story (>50,000 years before current at least). They are later known as the 8 Great Clans. They are named so since they had a Dou Di who started the clan and they are his blood descendants. . The Xiao clan entered the 8 Ancient clans because of their ancestor at the peak of Dou Di realm.