Vampyr (German: Vampyr – Der Traum des Allan Gray, lit. ‘Vampyr: The Dream of Allan Gray’) is a 1932 gothic horror film directed by Danish director Carl Theodor Dreyer. The film was written by Dreyer and Christen Jul based on elements from J. Sheridan Le Fanu’s 1872 collection of supernatural stories In a Glass Darkly.
Vampyr was funded by Nicolas de Gunzburg who starred in the film under the name of Julian West among a mostly non-professional cast. Gunzburg plays the role of Allan Gray, a student of the occult who enters the village of Courtempierre, which is under the curse of a vampire.
I wanted to know why it was described in that specific way, rather than saying it was based on Carmilla. Wikipedia says: