Energy shielding

Several UNSC, Covenant and Forerunner vehicles, devices and armor systems make use of Energy shielding to protect users from harm. Energy shields consist of a field of energized particles that wraps around a surface, which deflects objects that attempt to impact the surface.

Human energy shielding
Humans started using energy shield technology with the production of the MJOLNIR Mark V powered assault armor, and has since been incorporated into all later models. This breakthrough was achieved through reverse-engineering the technology used in Kig-yar point defense gauntlets. Unlike the Covenant Elite Personal Energy Shield, when the human shield takes damage, it glows gold instead of blue.

Although the shields of MJOLNIR armor are very resilient, they can be stripped in seconds if the wearer isn't careful. Plasma weapons are especially effective against MJOLNIR and Elite Personal Energy Shield shields. Plasma Rifles, Plasma Pistols, and Plasma Cannons are all very good at depleting the MJOLNIR's shields.

One of the UNSC's most recent breakthroughs in energy shield development came with the creation of the YSS-1000 starfighter, which is the first human spacecraft known to use energy shields.

During the Fall of Reach, ONI utilized a prototype "drop shield" which had the protective abilities of the bubble shield and the healing abilities of a regenerator. Collapsing under continuous fire, the drop shield proved to be not as indestructible as the bubble shield, and not as fast a healer as the regenerator. The shield itself greatly resembles the bubble shield, even sporting its counterpart's comprising geometric shapes, but is instead blue in color.

Covenant energy shielding
The Covenant make extensive use of energy shielding technology. Nearly all Covenant starships larger than a Corvette use energy shields, and several ground-based structures, such as Covenant bases and Spires, use shields as well. Species such as Sangheili, Kig-yar, Jiralhanae, Huragok and high-ranking Yanme'e make use of personal energy shields of various types on the battlefield.

Also, the Covenant have discovered how to run Active Camo and Shielding at the same time. Even Tartarus and the Prophet of Regret were equipped with personal shields. Regret's shield, presumably projected by his Gravity Throne, was very similar to the Bubble Shield. It deflected all forms of projectile, plasma, and explosive weaponry and never depleted. It was also similar in that one could simply walk through the shield. It was this that allowed the Master Chief to kill Regret. Tartarus' shield is much different and seems to have to be actively turned on. His shield would deflect almost all attacks from the elites, even energy swords, and the only weapon really able to overload it was a beam rifle. It is implied that other Brutes do not have this type of shielding since Cortana says when first fighting brutes on the level Gravemind: "They don't have shield generators, but take them out before... it's berserking!".

Starship shielding
Nearly all Covenant vessels are protected by a highly resistant energy shield. The shields can withstand an impressive amount of punishment, and can recharge very quickly. Shields can absorb almost all missile fire, including hundreds of Archer Missiles and even a Shiva nuclear missile (although Shiva nukes will usually deplete their shields, making them vulnerable to smaller weapons). The only UNSC weapons capable of penetrating a Covenant Starship's Shield are the MAC guns. Even then, ship-based MACs take multiple rounds to drop the shields; only a Super-MAC round from an Orbital Defense Platform can penetrate Covenant shields in one hit.

Covenant starship shielding does have a notable flaw, however: Whenever a starship launches a plasma torpedo or pulse laser, a small section of the energy shield drops to allow the weapon to fire. Otherwise, the energy released would detonate on the inside of the shields, damaging the ship itself. This weakness was demonstrated when a group of Spartans destroyed a Covenant ship in Halo: Fall of Reach, by going inside of the ship and planting an explosive. Additionally, when a Covenant ship unloads troops and supplies, it must lower its shields to let dropships out.

While projectile weaponry is generally ineffective against Covenant starship shielding, directed-energy weaponry can disable shields with relative ease, in much the same manner as Elite Personal Energy Shields. Another way to disable the shipboard energy shields is through the use of a large-scale electro-magnetic pulse, or EMP.

Forerunner energy shielding


Many Forerunner constructs make use of some form of energy shield. Standard Forerunner Sentinels are encased within an ovoid energy shield that can withstand moderate damage, while Onyx Sentinels possess spherical golden shields that activate whenever a fast-moving projectile approaches. The larger Enforcers posess a three-part energy shield that protects their photoreceptor and chassis from frontal assault, but does not protect against attack from any other angle.

The majority of Forerunner energy shields seem to consist of a translucent bubble composed of hexagonal patterns, as opposed to the wraparound shields typically used by the Covenant and UNSC. The Bubble shield also projects a similar shield, perhaps implying that it is an example of Forerunner technology.

Gameplay

 * In Halo: Combat Evolved, the status of the energy shield is shown at the top-right corner of the screen above the health bar, in Halo 2, it is in the bottom-left above the motion tracker, in Halo 3, it is in the top-center of the screen, and in Halo: Reach, it is shown in the top-center of the screen above the health bar. They have been modified since Halo: Combat Evolved to charge faster and be more resistant.
 * Both in Campaign and Multiplayer shields protect you for a brief amount of time from small arms and weapons. However, in Multiplayer, you can have 50%, 100%, 200%, 300%, 400% (Halo: Combat Evolved), 500%, 1000%, 2000% shield, or none at all. Both Elites and Spartans have the same amount of shielding. A player's shields can be further augmented if they pick up an Overshield.
 * In Halo CE under standard game settings, energy shields begin regenerating 5 seconds after last being hit, and take 4 seconds to fully recharge from a total drain.
 * In Halo 2 and Halo 3 under standard game settings, energy shields begin regenerating 4.25 seconds after last being hit, and take 1.75 seconds to fully recharge from a total drain.
 * According to the E3 demo of the Halo: Reach campaign, energy shields begin regenerating 6 seconds after last being hit, and take 2.75 seconds to fully recharge from a total drain. Multiplayer regeneration may follow different numbers.
 * A Regenerator can be used to make your shields recharge very quickly after taking damage.
 * If a player deploys a Bubble Shield they will be protected from weapons fire by a spherical energy shield.
 * Activating the Deployable Cover will generate a stationary energy shield that regenerates after disabled by continuous damage.
 * Shield doors can be found on several maps and can be placed in all DLC maps in Forge In Halo 3, and in most of the maps in Forge in Halo: Reach.

Trivia

 * In Halo: Combat Evolved, the shielding that Elites use is slightly stronger than that of a Spartan. Elites' shields only take 70% of the damage that projectile weapons deal out, whereas a Spartan's shielding tends to take full damage. (Case in point, the Spartan shield, with 75 hit points, only takes three shots from the M6D Pistol to break, whereas a Minor Elite's shield, which has 100 hit points, takes 8 shots from the same weapon.) Apparently this was changed in Halo 2 and 3 - in Halo 2, it takes four bursts from a Battle Rifle to break either a Spartan's shield or a Minor Elite's shield.
 * In Halo 3, in Campaign, the energy shields of Shielded Flood Combat forms do not flare when taking damage, like the Brute Power Armor. However, other Elite's shields still flare when taking damage.
 * In Halo 3: ODST, certain Drones are outfitted with personal shields.

Related Pages

 * MJOLNIR Armor
 * Elite Personal Energy Shield
 * Jackal Point Defense Gauntlet
 * Bubble Shield
 * Overshields
 * Regenerator
 * Stationary Shield Generator
 * Portable Shield Generator