What is "unpiece"

Usage examples of "unpiece".

Already you could see through the dust on the ponies' hides the painted chevrons and the hands and rising suns and birds and fish of every device like the shade of old work through sizing on a canvas and now too you could hear above the pound­ing of the unshod hooves the piping of the quena, flutes niade from human bones, and some among the company had begun to saw back on their mounts and some to mill in confusion when up from the offside of those ponies there rose a fabled horde of mounted lancers and archers bearing shields bedight with bits of broken mirrorglass that cast a thousand unpieced suns against the eyes of their enemies.