According to Lili's account, the vampire clan has an extreme thirst for blood and is highly skilled in disguise and enchantment. There was once a vampire king known as Ghost King, who used blood, sex, and a blood magic called Blood Calamity to transform his targets into blood-like creatures. This is why vampires appear almost identical to humans.
After hundreds of years of growth, Ghost King secretly controlled several hereditary noble families in the Light Dragon Empire, aside from the four great families. He once wielded immense influence in the empire, manipulating imperial decisions, and secretly established a vampire dynasty.
