All the members of the Blood Clan in the Rand Kingdom actually came from the Blood Clan during the pandemic outbreak at Fox Hole, the "Progenitor." Although it bordered the Black Marsh Kingdom, after so many years, they had never thought about returning.
The extended life span had cost the Blood Clan much, including emotions. They rarely experienced feelings like "love" or "gratitude." What remained were the instincts sifted through the net of time, such as arrogance, vanity, hatred, and greed.
They had no obsession with returning to their homeland, and from the stories told by the monarch, the Blood Clan of the Black Marsh Kingdom was actually very weak.
They originated from the Black Marsh Kingdom but had no special feelings for it, only citing the Blood Clan there as evidence when casually discussing their long history.