Vampire's Thrall

Vampire's Thrall is a creature that is the result of the power, Vampire's Servant, in The Elder Scrolls V: Skyrim.

Characteristics
They are beings that are forcibly under the control of a Vampire, and thus possess no free will of their own. They will attack the Dragonborn on sight. Be wary, as finding a Thrall ensures that a Vampire will be nearby. It is believed that they are former adventurers, exploring the caves. Even though the thralls seem to have no free will, they seem to have retained some measure of greed. For instance, sometimes you will see (or hear) a vampire's thrall searching bodys and making remarks like, "Oooo, still got a bit of gold on, you don't you friend?" and " Nice boots you got on, too, won't be needing those anymore."

Also, when fighting a thrall, it is wise to ignore them and run to the vampire and kill him/her. Once the vampire is dead, its thralls will die with it.

In the new Dawnguard expanison, if the Dragonborn decides to become a vampire lord, more insight into how thralls can be made is revealed. In one such quest, the Dragonborn is tasked with creating a thrall from a Moth Priest to make him read you an Elder Scroll. In little mini quests some of the vampires at the vampire's castle will give you, you may be asked to find a random citizen in Skyrim and us your Vampire's Seduction spell against them and feed on them to make them a true blooded vampire which is the same way a thrall is made.