How do you mean, done in Oblivion?
I meant that it would be cool if there was the option to be a Cyrodiil vampire, and as long as there was even one Cyrodiil vampire NPC in the game you would be able to get the disease. As Skyrim should be Volkihar dominated.
I mean that the adventuring vampire was done in Oblivion. All we did was adventure, there was no vampire quests(Pro-vampire clan quests) just cure for vampirism and a few others.
I know that the Volkihar dominates since they are the most powerful Clan, but don't forget that they are located in East Skyrim.
"He wanted to know about the vampires of
eastern Skyrim. I told him about the most powerful tribe, the Volkihar, paranoid and cruel, whose very breath could freeze their victims' blood in the veins. I explained to him how they lived beneath the ice of rempote and haunted lakes, never venturing into the world of man except to feed."-Immortal Blood.
So, there should be other vamire clans native to Skyrim. I think they should add three, the Volkhirar, the Order and the other vampire clan we don't know of. But remember, as powerful as these clans can be, the Order's members could blend in society and are very manipulative people, they could even make an allegiance with a vampire clan in hopes of destroying them by pitting them against a rival clan, but since the Volkihar are paranoid, I don't see that happening at all.
Since the Order are like the Imperial's and "ousted" all other competitors, it's obvious that they don't tolerate other vampire clans, even the enlightened ones such as the Whet Feng Sodality in Black marsh. Explains why they are the only clan in Cyrodiil, because they don't like sharing at all. And since every other province had more than one vampire clan, we can speculate that the Order are much like Imperials, they just go in and enforce order because their power hungry vampires.
"There was but one tribe in Cyrodiil, a powerful clan who had ousted all other competitors, much like the Imperials themselves had done"-Immortal Blood.
A vampire was would be amazing. Having three sides in Skyrim fighting against each other. While the Civil war between the nords happen, there could be a similar vampiric battle.