Onyx Sentinel

The Onyx Sentinel is Forerunner-created electromechanical variable configuration and purpose machine. It is extremely versatile, and is a powerful combatant on both the ground and in space. One of their primary advantages is a gold-colored Energy Shield that is completely resistant to all projectiles, even the rockets of the Rocket Launcher and LOTUS Mine detonations.

It is far superior to the regular Sentinels that guard the Halo ring-installations, and even the Sentinel Majors and Enforcers, due to its shielding and extreme firepower: a cut-down Energy Projector firing golden, lethal spears of light.