The vampires, the culprits behind the downfall of the El Empire.
After that catastrophe, a large number of former El Nobility pledged allegiance to the vast alliance of vampires and ogres, offering loyalty to the vampires to extend their limited lifespan.
Only those marginalized royals and local nobility, led by Miseria, escaped to the Eastern Continent.
Therefore, within the Blood and Flesh Royal Court, they never consider themselves vampires, but rather blood elves. And ogres are not ogres, they are called giants.
For religious reasons, the Royal Court wants the territory of the Eastern Continent, while for political reasons, the Empire wants the territory of the Western Continent.
So in the millennium after the shattering of the Blood Race Holy Grail, war has always been the main theme between the two sides.