Dear Mother,
J’Zhirr is tasked by Jarl Ravencrone to clear out Movarth’s lair. It is a short distance away from the Morthal. Vampires and their thralls inhabit the cave. Vampire’s thralls are the mindless servants of the vampires and will fight to the death to protect their masters. To find one, means that a vampire is nearby.
Postcards from Skyrim 