The Makai (World of Spirits) seems to be implying the place where the dead go.
In Western World religion, it would be hell/heaven/purgatory/limbo.
Dracula cannot go to heaven, and I don't think he goes to Hell either, so I'm guessing he goes to a void in Limbo/purgatory.
At first I thought it would just be "The Void", or "The Chaos Realm" but that's not where the dead go from what that word seems to mean.