The answer is: mystery
In literature, mood is the emotional setting of the scene that arouses the mental state of the readers.
In the excerpt from Edgar Allan Poe's "The Raven," the story directs attention to a young man's visitor who is visited by a raven at night. Therefore, since the man grieves the loss of his lover and is slowly dispossessed of his mental faculties, the author creates a supernatural and magical mood to introduce the raven's approach.
