Thrall

A Thrall is a human person put under some kind of mental control. (Ch 27, Blood Rites)

Description
A Thrall can be freed or recover over time, unlike Renfields. (Ch 27,  Blood Rites )
 * A Rough Thrall basically stand around looking blank untill they get orders. They don't make very good sentries.
 * A Fine Thrall is so controlled that they might not even know they are a thrall at all. It takes a subtle hand, a lot of time and a certain amount of empathy. — sort of like what Justin DuMorne did to Elaine Mallory.

History in Series
Mavra has made a nest with her scourge under a homeless shelter through Undertown. She has made Rough Thralls of some of the shelter's staff to cover for them. (Ch 27,  Blood Rites )