QUOTE(SubRosa @ Dec 7 2013, 03:05 AM)

I found a weird side effect to my Kynareth amulets. They work by giving you the Voice of the Sky power you get from reading all the etched tablets on the way up High Hrothgar. All that really does is put you in the Kyne's Peace faction. And all that does is make the Predator and Prey factions friendly to you. Somehow this also makes vampires friendly. Yep, I just discovered this in Dimhollow Crypt.
I took at look at the vampires, and the only faction they seem to be in is the vampire faction. Taking a look at that, I do not see anything that would make them friendly to the Predator or Prey factions, and certainly not the Kyne's Peace faction. So I have no idea why this is happening. I set the vampire faction to be enemies of the Kyne's Peace faction, and will see what that does.
The only possible explanation I can come up with for this is that maybe Vampires/NPCs in the Vampire faction are part of the Predator faction. Considering that in traditional vampire lore, and in the Ur-Text of vampire canon, Dracula, the Count (and presumably other vampires) is able to command predators like wolves, this might have been Bethesda working that into the game a little bit; members of the Predator faction are friendly to vampires to represent this command.
Alternatively, the coding may have just gone squiffy, that's another possibility.