Unmasked Theron

From Gears of War Realm - Gears of War Wiki Strategy Guide

The Unmasked Theron is a variant of the Theron Guard/Sentinel. He is exactly the same as the other Therons but he doesn't wears helmet. They appear at the end of act 3, where Raam executes a Red Shirt, they're the ones who hold him. They're also the ones who ride Reavers in act 5.