Fall of Reach - Mjolnir Sensor

A flicker of a contact appeared on the Master Chief’s motion tracker—then vanished. He turned and brought his assault rifle to bear. Nothing. “Hang on, Blue-One. I’m going to check our six.”

Linda’s acknowledgment light winked on. The Master Chief eased back down the passage ten meters. No sensor contact. There was just dim red light and shadows . . . but one of the shadows moved. It only took an instant for the image to fully resister: a black film peeled away from the darkness. It was a meter taller than John and wore blue armor similar to that on Covenant warships. Its helmet was elongated and it had rows of sharp teeth; it looked like it was smiling at him.

- Halo: Fall of Reach, Chapter 35