The Knights of the Black Earth
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The Knights of the Black Earth is a 1995 novel written by Don Perrin and Margaret Weis.
The Knights of the Black Earth is a novel in which cyborg mercenary Xris is gunning for revenge. Betrayed by his former friend Dalin Rowan—who sold out to an alien race and caused an ambush that killed a colleague and left Xris critically wounded—he is determined to settle the score. Rowan, who underwent a sex change to stay hidden, becomes the target of Xris and his squad, though their mission is complicated by the intervention of the sinister Knights of the Black Earth.[1]