Vampire Nightstalker are a subspecies of vampire. Like all Vampires, they are afflicted with the disease, Sanguinare Vampiris, and as such, can infect the Dragonborn with it.
Battle behavior[]
Vampire Nightstalkers employ a stronger Vampiric Drain Destruction spell. When successfully targeted, the foe's health and stamina are sapped, healing the vampire. This attack has the ability to pass Sanguinare Vampiris to the target, leading to vampirism if left uncured.