Krozair of Kregen (Dray Prescot #14)

the long version

Never before in his fantastic career on Kregen, planet of the twin suns of Antares, had Dray Prescot been in such a desperate predicament. A despised outcast by his friends who wore the red of Zair, he had now been condemned by his old enemies whose battle color was the green of the sun Grodno. For while among these slavers and conquerors of the green, searching for a way to turn the tide of war to his own redemption and his friends' advantage, he had personally encountered the deadly animosity of Grodno's king, had betrayed his champion, and had shattered all he had so carefully worked for. But continue he must, for now, in addition to the enormous feat that alone would restore his honor, he had a blood vengeance to achieve that overrode everything.