Not to reopen old discussions (and I didn't even comment on Grave of Ships, or call it Dark Fantasy) but to me, Dark Fantasy is more of a sibling to horror than a subset, a step between Horror and Fantasy - in that fantastic elements (not necessarily supernatural, could be mythological) or settings are used but the intention of the story is not wholly to horrify or disturb, the intent of the story could just be evocative, like a lot of fantasy, but evocative of a mood with a darker tinge. You can't critically respond to a dark fantasy story with "that wasn't scary", might be a way of looking at it from the other direction. A lot of Lord Dunsany and Tanith Lee and Karl Edward Wagner fall into Dark Fantasy, from my view