Sentence:  Like other forms of revisions, <WSD>darkfics</WSD> are “canon-corrective,” and specifically aimed at what are considered to be underdeveloped “images of intense violence and broody introspection,” which, if dealt with at all in the canons, are “forgotten by the time the next episode or issue comes around” (Fanlore, “Darkfic” n. pag.). 
Meaning of the word marked with <WSD> tags:  A fanfic which intentionally deals with situations and themes that are disturbing.