Koryk was a soldier in Fiddler's squad in the Bonehunters army. He frequently came into conflict with Smiles, another member of his squad. He had a flat featured face, broad shoulders, and long black hair which had a tendency to whip across his face. He was half Seti, and clearly identified himself with that racial group.
He fell ill with the Letherii version of the shakes. After recovering he became a changed man, falling into a kind of depression, which made even Smiles turn away from him.