Viscous Circle (Cluster, Bk. 5)

From the back cover:

In the far, far future the bloodthirsty Solarians, in their rage to find the mysterious Ancient Site, are determined to wipe out the Bands, a strange and beautiful species whose society is an anarchy of peace. Only Rondl, the whirling green Bamd, can save his race, for he has a singular and awesome knowledge. But suddenly Rondl makes a shocking discovery about his identity -- a discovery that may cost him his honor, his beautiful lover Cirl, even his very life.

THE GALACTIC ANNIHILATION IS BEGINNING!