Parts of the Bible are Egyptian, Arabian and Jewish history and other parts are Egyptian, Arabian and Jewish mythology, at least in my eyes. It should be notes that the Vikings of Bohemia welcomed Ahmad in Fadlan from Persia to trade with his family, and markings on certain Viking Swords from the time period imply that the Muslims were actually a positive influence on Viking culture, which was mostly Barbaric, had Christian-Islamic markings in the coming centuries. This isn't to say that Turkey did not war after the Ottoman Empire had banded and disbanded over and over, but that isn't to be blamed on racial relations - there was a serious political struggle in Bohemia for centuries afterward, though the Czech and Romanians have a completely different history with Turkey in the 1400s. But Persia and Arabia have been friends, enemies and every which way with Eurasian countries for a long time. This kind of stuff is all relevant to modern fantasy, but the crusades, which are a major point in history, are rarely referenced. The Jewish, Muslims, and Christians all fought for ages over specific regions of the middle east and racial wars, nonracial religious wars, multiracial wars against specific states, war rape, the death of old Lebanon (who is pure Lebanese?) Ottoman struggles, Turkish-Roman treaties and miniwars, the assaults on Armenia, political deaths... there's a reason people don't depict racial struggles in fantasy, I mean I feel bad thinking about some of this stuff. Anyways, there's always Star Treck, which portrays stereotypes in a mature way and doesn't discriminate races, usually. Now to answer the question, the main reason black fantasy is uncommon is because of the British Royalty Influence of the Middle ages and Roman history, like listen to the Steely Dan song, Kings, which is about Prince Arthur's elder brothers. King John was the great man who proposed and signed in Habeas Corpus, which is still used in modern judicial systems. If a prisoner is sentenced, no matter what the sentence, even postmortem their suit may be revisited and any unlawful business related to their sentencing can be punished and if the prisoner, upon opening of the new case, is alive and proven to be innocent they will be released. Most people who aren't lawyers don't know this, but it even applies today if you've been unlawfully charged and it can be proven. The question I have, is what type of black fantasy do you want to read? I think Egyptian fantasy would be a neat topic, almost entirely unexplored.