Nergaoul

One of the Unmade, named in Hessi's Mythica as a spren that drives armies into a battle rage, lending them ferocity. It does this to both sides of a conflict — Voidbringer and human alike — and the author argues it has remained active on Roshar long after the supposed end of the Desolations, explaining the Alethi Thrill of battle and the visions of red mist that accompany it. SA:OB:Ch 100