Rise from the coffin and rebuild the vampire empire

This book roughly covers the following content. Please don’t criticize if you don’t like it.
[Vampire Protagonist] [Pseudo DND] [Warhammer] [Travel to Another World] [Fantasy Hegemony Farming] [NPC Roleplay], etc. Please refer to the content of this book for the specific world view setting.
The following is a serious introduction:
After sleeping for a thousand years, he finally woke up from his coffin.
"Now standing before you,
He is the Grand Master of the Blood Oath Knights, the First Baturu of the Blood Empire, one of the five ancestors of the Blood Clan, the King of Blood, the Champion Warrior chosen by the Lady of Darkness, and the protector of the half-elves and the Arid people.
—Karen Aegris Bloodsworn.
However, when Karen woke up, the empire had already perished a thousand years ago.
The empire collapsed, the mountains and rivers were shattered, and countless ancient castles were reduced to ruins.
Lingering on, hiding in the darkness, the vampires are tormented by their blood thirst.
Today is the year 2759 of the Human Imperial Calendar.
Emperor Skoma, who forged the human empire, had long since ascended to godhood, and humans now ruled the Old Continent.
The vampires have been in decline for too long and are longing for a shocking change.
As the [last vampire ancestor], looking at the lively little players around me.
Karen was full of confidence and shouted:
"Rebuilding the Blood Clan Empire is our duty!"

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