This is what the battletome has to say (page 16,
Lords of the Night header) about Vampires in the different Realms:
"Like the noble houses of the free cities, each dynasty posses its own tradition, heraldry, bitter rivalries and scurrilous gossip. Many such characteristics are defined by the magical curse within them reacting to the inherent magical energies of their home realm as much as any cultural or sociological factor; for instance, Aqshian vampires struggle to control their raging passions and thus spread their line as far as possible, while the withered Tengorez of Hysh emerge only rarely from their crystal lairs in order to capture the arcane war machines of the Xintilian armies and corrupt them to better focus necromantic energies."
Not a whole lot, but two Realms gives an idea on how the other ones can work.
Then on page 43 in the Deathrattle Skeletons has this little tidbit:
"No realm is safe from this bleak colonisation; in Ghyran, Deathrattle Skeletons infested with corpse-fungi and writhing throttle-vines march through the twisted forests of Decreptia; while in Ghur, their remains are spliced with the bones of that realm's manifold predators, for the vampiric chieftains and corpse-shamans of the plains believe that such will infuse the Deathrattle with the animal fury of these beasts in battle."
Speaking of Ghur, there's the Avengori Dynasty who have a very full write-up as a "Here's how you can fluff Vampires existing in a Realm" and they are well....
off their frigging gourds, even by vampire standards:
"Merely to look upon the hosts of the Avengorii Dynasty is to risk being driven mad with terror. These Ghurish vampires have long since abandoned even the pretence of humanity, entirely surrendering to the raging beast within and supped deeply upon powerful ending-magics. Accompanied by flights of shrieking Vargheists and bloated corpse-monsters who swoop down from shadowed skies to tear at the foe, these warped Gravelords give full rein to their unnatural impulses, feasting clotted gore and spreading utter desolation.
Unlike the Vyrkos, the Avengorii make no effort to restrain their monstrous aspect. The majority are not generals, knights or connoisseurs but ravening abominations who believe the beast within ought to be embraced.
Though there is an undeniable comparison to be drawn, the Avengorii are a breed apart from the abhorrants of Ushoran - indeed, they take great offence to the comparison, as more than one mortal has discovered to their cost. The lords of the Sascathran Dunes are generally lucid, if not sane, with the majority being well aware of their ghastly they appear to others. Many Avengorii make a show of revelling in this apparent disgust, though such may simply be a way of coping with the transformation they have wrought unto themselves. Either way, through acknowledging of their own primal natures, they have proven more than capable of thriving in the savage lands of Ghur."
I genuinely find it funny that the Avengorii take offense to being compared to the Abhorrants, despite there being a question of which set of vampires is the less sane one
