Douglas Hill 
Day of the Starwind 

Keill Randor, the Last Legionary, and his alien companion, Glr, set course for the uninhabited planet of Rilyn in the Jitrell Federation to investigate the sinister activities of the Overseers’ deadly enemy, the Warlord, and his agents the Deathwing.Amongst these strange and deadly life-forms on Rilyn, Keill encounters the grotesque, golden figure of the Altern, "The One", leader of the Deathwing. In a thrilling climax, Keill must not only pit his wits against the concerted forces of the Deathwing band of warrior clones but also defend himself and Glr from the savage futy of the elements as the murderous Starwind begins to blow.