Onyx Sentinel
From Halopedia, the Halo wiki
Summary
The Onyx Sentinel is Forerunner-created electromechanical variable configuration and purpose machine.
Appearance
The Onyx Sentinel shares a similar appearance to the Monitors - with a round sphere in the center, and with a central "eye" that glows golden. The eye is the cut-down Energy Projector. However, it also has three metal booms extending from equistidant points on the surface of the central sphere. With a height of three meters.
Combat
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. However the shield is fouled by slow moving objects, such as a rock, which was used to destroy one a Onyx. It is also very adaptive, a spartan even said we are teaching it how to fight.
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. A single impact causes devastating damage; the destruction of a granite plateau, vaporization of a combat bunker, and the instantaneous destruction of any ground vehicle or infantryman, including a SPARTAN-III. Enough sentinels can even vaporize a large starship.
