Board Thread:Suggestions forum/@comment-27200931-20160428032004/@comment-26444332-20160428182615

Just so you know, the Witch-king was accompanied by black-horsed and black-armored companies of mannish guards when he fought with the last king of Gondor. Perhaps those would be your basis of Black Númenoreans. Also, the black-garbed mounted soldiery that rode with the Mouth of Sauron could also have been the Men of the Shadow.