I think he is talking about how the royal family has a curse?? ┑(￣Д ￣)┍ Something like that which some of the offspring will be excel at everything but in return they will have no emotion (essentially like being an Android)
That is exactly what he's talking about actually.
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SPOILER ALERT
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According to the novel, someone like Cecil is born into the royal family every few generations starting with the founder of their country. The next chapter is probably going to explain this.
Shook Σ( ￣□￣||)
Is he talking about his yandere blood...? ٩(๑❛ᴗ❛๑)۶