Brandon Sandersons White Sand Omnibus

On the planet of Taldain, the legendary Sand Masters harness arcane powers to manipulate sand in spectacular ways. But when they are slaughtered in a sinister conspiracy, the weakest of their number, Kenton, believes himself to be the only survivor. With enemies closing in on all sides, Kenton forges an unlikely partnership with Khriss--a mysterious Darksider who hides secrets of her own.