Human trophy taking was common in Southern Peru around 500-800 AD, but was it caused by environmental stress or the rise of the militaristic Wari Empire? Did Wari attack communities in Arequipa (S. Peru), or did Wari influence reach the area through trade? Sr and Pb isotope analysis will allow us to determine whether trophy victims from Uraca were locals or foreigners answering whether Wari was in the region, and who Uraca’s enemies were- local neighbors, Wari conquerors, or other tribes from afar?