The problem in writing vampires in The Elder Scrolls Online is not that you have to invent a reason for them to exist; no, according to a new piece on the official site about the upcoming Greymoor story, the problem is making them distinct. After all, this is almost certainly not the first time that the players have fought against vampires. It may not even be the first time fighting vampires today. So how do you make them feel different? You give them a motivation that involves potentially escaping the fate of being a vampire… and tie it into a conspiracy reaching far beyond Western Skyrim, where the story takes place.the dark heart or writing pumping beneath the skin.
Source: Official Site