Legend of the Abyss
The Orc horde of the Svartalfheim has fought against the Dwarfs since a time before the Tearing. Who or what their leaders are is unknown as Orcs have never pain the time to talk, even when “captured” they fight until death.
Many times “Half-Orcs” have come about since the Tearing from survivors of Humans who have set up colonies in the lower depths of Hallrgard. These “Unions” are unfailingly the result of rape after the massacre of these colonies, and many human mothers tend to kill their Half-Orc children then bear them. Some are not killed however and these “survivors” while rational and more like human in temperament than orcs, always maintain a predominant appearance of Orcs and live on the outskirts of society, usually taking up roles as thugs or working for organized crime.