Well in my opinion the only thing they did not get right about the volkihar is the powers they fit right on the mark when it comes to personality/clan they are cruel and keep to themselves(This is how I see them being paranoid since they live in a castle feeding off thralls who they most likely capture when people wander the shores harkon said they "Live away from the cares of the world") no where in the immortal blood does it say they are savages. I should of said in my previous post that it was speculation on my part since immortal blood describes them as being paranoid and it is simply my view on why they are.
Spoiler Heck harkon tries to kill the PC since he thinks you are going to betray him and depending on dialogue choices your PC intends to give harkon the bow yet he attacks you anyway. The whole court system is based on paranoia how do you think harkon has kept his seat for so long? Even the vingalmo tells you not to trust Orthjolf and vice versa with Orthjolf. Thats why I said that volkihar vampires normally worry about power plays within their court since everyone out in the court is out for their position and harkon's position. Cyrodil vampires can concentrate on mortal affairs/politics since they pretty much kill any cyrodil vampire that enters their territory without a good reason
Plus I never said they don't go out to feed or go into a town to feed I said they don't CARE for mortal affairs/politics like the cyrodil vampires. I still think thats keeping to themselves if they only go out to feed. Plus cyrodil vampires simply PREFER to feed on sleeping victims it does not say they are the only ones who do it in the immortal blood book. Nothing in the immortal blood book says that the volkihar cannot do this.
Immortal Blood volkihar extract
Spoiler The next day, he did return with more questions, these ones very specific. 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 remote and haunted lakes, never venturing into the world of men except to feed.
Movarth Piquine listened carefully, and asked more questions into the night, until at last he was ready to leave.
"I will not see you for a few days," he said. "But I will return, and tell you how helpful your information has been."
True to his word, the man returned to my chapel shortly after midnight four days later. There was a fresh scar on his cheek, but he was smiling that grim but satisfied smile of his.
"Your advice helped me very much," he said. "But you should know that the Volkihar have an additional ability you didn't mention. They can reach through the ice of their lakes without breaking it. It was quite a nasty surprise, being grabbed from below without any warning."
"How remarkable," I said with a laugh. "And terrifying. You're lucky you survived."
Nothing here says that they feed on people by dragging them through ice it just seems like to me personally an ability they use to kill people(its unfortuane that this skill is not in by I explain why I think it was not added). In this extract it does not say they are savages it does not say they cannot feed on sleeping people. Plus I never said that volkihar do not go out to feed I was simply explaining why they don't care for human politics and affairs.
On cyrodil vampires
They were cultured, more civilized than the vampires of the provinces, preferring to feed on victims while they were asleep, unaware.
The cyrodil vampires feeding methods are PREFERENCE that means other clans can feed this way if THEY CHOOSE to.
I can see this would not go anywhere we have differing opinions so lets just agree to disagree.