Benhai

The Benhai were a major power during the Mage Wars, specifically on the Agras Plain during the First Chaotic Period. The empire eventually broke up, and survived into the modern era in the form of various nation-states, some of which joined Eieber's Alliance.

The one commonality between all Benhai is their original language, which famously includes no word for "negotiate", perhaps part of why the empire eventually broke apart.