The closest thing I’ve ever done to a vampire Otherworld is create the Vampiric Cloister known as Toburaishima- formerly an imperial Japanese colony out in the middle of nowhere in the pacific that was basically annexed by the US after WWII, turned into a naval base and a small vacation locale- its main attraction being near a blue hole that supposedly had a sunken structure resting at the bottom.

What most didn’t know is that the island was once home to a now long extinct clan of Kindred who were adept at suffusing their Blood into the world around them.. and it created a place...