Main article: Crown Store
"One who uses this will be cursed—or blessed—with Noxiphilic Sanguivoria, and will become a Child of the Night. In other words: a vampire! (Priests of Arkay can cure this affliction, if desired.)"
―Crown Store description

Curse of Vampirism is a utility available for purchase from the Crown Store that allows the Vestige to become a vampire.