We apparently we have two kinds of Blood knights. Gray Host Blood Knights which are created alchemically and normal Blood knights which are apparently created by consuming the power of other vampires.
What are the lore implications of such creatures existing in the Elder Scrolls universe since we've never seen them in other games? If a normal vampire can become a blood knight by feeding on other vampires why haven't we seen them before in other games? Vampire Lords can be questioned by the same line of thinking but they were seen as rare and mythical in Skyrim, while in ESO we have Blood Knights in pretty much every corner of Greymoor.
PC NA - Ceyanna Ashton - Breton Vampire MagDK