Board Thread:Suggestions forum/@comment-29212138-20170526182111/@comment-26633547-20170527195604

"Many became enamoured of the Darkness and the black arts; some were given over wholly to idleness and ease, and some fought among themselves, until they were conquered in their weakness by the wild men."

The semicolon in the middle of the sentence indicates that the two parts of the sentence are separated and are not derived one from the other. "When a  semicolon is used to join two or more ideas (parts) in a  sentence, those ideas are then given equal position or rank." - Google

So some of the Numenoreans became enamoured of the Darkness and the black arts, and became the black Numenoreans. In addition to that, some of the Numenorean settlers have declined, fought amongst themselves and were conquered by wild men.

So this means that there were Black Numenoreans that didn't decline and weren't conquered by wild men. Otherwise, this sentence would have connected the two ideas with a word of conjunction like "as a result", and weren't separated by a semicolon. That semicolon actually proves my point.