If you want information
Luminous Valentine is Sylvia's older sister
Veldanava who is the creator of the world as well as Milim's father created a creature that brought civilization to this earth
That creature was the "Human God" Ancestor. But unfortunately he couldn't complete the task because he was immortal, so he couldn't give birth to offspring
Therefore, Ancestor experimented with using his own body and finally two creatures who were a new race were born, namely Ignorant the High Human and Luminous the Vampire.
However, Ancestor didn't stop experimenting and he created a new race from the spirits that enveloped the earth
As a result, four new races were created in succession namely
- High Elf (spirit of the wind)
- High Dwarf (earth spirit)
- Enki (spirit of fire)
- Siren (water spirit)
Well, the first High Elf created was Sylvia and for the High Dwarf it was Guran Dwargo. As for Enki and Siren it's still unknown as of now
Thus, the four ancestors of each of these races are called brothers because they were born from the Ancestor's experiments
But unfortunately, the experiment actually became the reason for Ancestor's death. It was all because his own son, Luminous Valentine had killed him
Ilustrasi Light Novel volume 12 & 18
Sc post: Light Novel volume 17 & 19