When the Radoreans of old were hunted to extinction, the remnants of their bloodline became corrupt without the guidance of their ancestors. They grew to disregard intelligence, and favored the more beastly side of their race. These people became full blooded Orcs through their breeding, disregarding the part of their race that granted them more than brute strength.
The Auroreans saw no use in exterminating these race of Orcs, so mistakenly let them roam free to do what they please. Through the years, the Orcs bred like rabbits, leaving a legacy that could never be properly destroyed. The only mapped "civilization" of the Orcs, are the Tusk Tooth Raiders. The largest clan of Orcs, that have carved their home on the coast of the Rusted Sea.
While historically the Orcs have been a relentless, bloodthirsty, unforgiving race; the clan still welcomes Half-Orcs in their midst, that control the means of economy and politics.