I Cultivated in a Coffin for Five Hundred Years and Became the Ancestor of Succubi

Qin Tianming had sealed himself inside his coffin to cultivate for 500 years, and had only recently awakened. Then he heard a group of young women shouting in front of his coffin. “Descendants of the Succubus Clan, we beg our ancestor to emerge from seclusion!” The Succubus Clan? What kind of clan is that? How have I never heard of them? When did I become their ancestor? What happened over these 500 years? Someone explain this to me!