* Horror: The novel features elements of cosmic horror, psychological horror, and supernatural horror. It explores themes of fear, isolation, and the unknown.
* Gothic: It employs elements of gothic literature such as a dark and atmospheric setting, a sense of decay, and a focus on the supernatural.
* Fantasy: The novel features elements of fantasy, including magical beings and a world with different laws of physics.
* Psychological thriller: The novel also features elements of a psychological thriller, with its exploration of the protagonist's mental state and the nature of reality.
Some critics also classify "The Fallen" as experimental fiction due to its unconventional narrative structure and its use of language.
Ultimately, the genre of "The Fallen" is up for interpretation, but it is undeniable that it is a disturbing and thought-provoking novel that will stay with readers long after they finish it.