Jakathas

A high ranking devil who acts as a liaison between the Imperial Legion and the Infernal Army in the Demonfence.

Vistra encountered hims several times, it was the machinations of Jakathas that led Vistra and her comrades into an ambush that claimed all their lives except Vistra's. She later learned that the devil sacrificed all her men just to provide a convenient distraction that allowed him to acquire an artifact from the demons.