Lucian Taylor is damned – either through contact with an erotically pagan faerie world or through something degenerate in his own nature. He thinks of the damning thing inside him as a "faun." He becomes a writer, and when he moves to London he becomes trapped by the increasing reality of the dark imaginings of this creature within him, which become increasingly real. The portrait of a doomed artist – a man not unlike Machen himself.
Arthur Machen is the pen name of Arthur Llewellyn Jones (1863–1947), who was a leading Welsh author of the 1890s. He is best known for his influential supernatural, fantasy, and horror fiction. He also is well known for his leading role in creating the legend of the Angels of Mons.
Arthur Machen. Wikipedia.