This article, Type I Protective Energy Barrier, was written by Athena32. Please do not edit this fiction without the writer's permission.

The Type I Protective Energy Barrier was a type of energy shield used by The Royal Allegiance during the Swarm War.


While there were several types of protective barriers used by the Allegiance, none were more widespread than the Type I, the most basic and arguably the most powerful. While similar to shielding devices used by the Covenant, and, in the latter part of the 2600s, the UNSC, Allegiance shielding was often far superior, not due to any huge technological advances, but simply due to the massive energy generators inside the warships and vehicles that could provide the shields with massive amounts of energy.


The shield was often used as the first line of defence for any vehicle, warship or structure utilising it. Most widely used on armoured vehicles and warships, the shield provided a versatile and powerful defensive option, being heavily relied on alongside armour. As the most widespread shield type, it was used in nearly every way and scale- from shield penetrating bullets to planetary shields.

The most common projection type of this shield was an ovular 'bubble' which encapsulated the vehicle or warship. This maximised the power of the shield by minimising surface area. This provided a strong defence from long and medium range atacks, closer ranged attacks, for example fighters or infantry, could penetrate this field and attack from inside. Usually a secondary generator was used to counter this problem, providing close range protection whilst also improving structural integrity. This shield was contoured to the exact shape of the hull, though projected a few molecules underneath it. The field could be then extended outwards, increasing the structural integrity by several times.

Technical DetailsEdit

The shield was projected by a generator usually located deep inside the protective field. The shield took the form of an energy that partly absorbed, partly deflected and partly dissipated the energy it was struck by, mainly kinetic (bullets and MAC slugs), chemical (explosive weapons) or other forms of energy (directed energy weapons). The field's strength and integrity was almost directly proportional to its power source; a stronger power source could maintain a bigger and more resilient shield.

Unlike the shields of the Sangheili and other races, Allegiance shields were operated by creating layers of energetic distortion containing a high concentration of gravitons around the ship. This was several hundred times stronger than more conventional methods and was far more efficient at dissipating highly focused energy or kinetic impacts. In addition, graviton-based shields were invulnerable to ionised weaponry unlike conventional models.


  • Strategic Instruments DFX225 Shield Generator- A compact but powerful shield generator used on more advanced armoured vehicles such as the M46P Atlas Main Battle Tank and M47P Warden Light Tank. It provided protection against up to 750 gigajoules of bombardment within one minute.
  • Avalon Orbital DWX/S 9012 Shield Generator- A very powerful shield generator designed for protecting warships and large ground bases. In terms of warship shielding, it was not especially powerful, but very power efficient, meaning a better protection for the same amount of power. Notable users of this device were the Triton-class Heavy Destroyer and Celestia-class Assault Ship, which employed four and seven in unison respectively to provide protection. Each generator provided regenerative protection against around 116,650,000 terajoules of bombardment in one second.
Technology of The Royal Allegiance during the Swarm War
Energy Technology

Zero-Point energy | Micro Fusion Reactor

Weaponry Technology

Nuclear Weaponry | Particle Cannon | Overhead Weapon System | Freebore Pneumatic Effect Cannon | Electrothermal Acceleration | IRONHAMMER Weapon Mount | M252 Area/Point Defence Weapon System | M253 Area/Point Defence Weapon System | GATEKEEPER Device

Ammunition Technology

HEAT | HESH | RAPID | HEPAB | APFSTDS | HPSDAP | HPHE | HEPA | HVS/AP-HE | GDD | Ammunition Calibres of The Royal Allegiance

Armour Technology

SPBS-I Battle Armour | Energy Regenerative Armour | ACE Armour | MX610 Powered Combat Harness

Shielding Technology

Type I Protective Energy Barrier | Type II Protective Energy Barrier | Type III Protective Energy Barrier | Type IV Protective Energy Barrier | Type V Protective Energy Barrier | Type VI Protective Energy Barrier

Countermeasure Technology

M56 Point Defense Weapon System | M40 Self Defense Munitions Launcher | MD8 Integrated Laser Countermeasure System | MA70 Vertical Automated Rocket Launcher

Propulsion Technology

Ion Drive | Jump Drive | Slipspace Drive | Graviton Drive

Sensor and Navigation Technology

Compound Imaging Scope | VISTA Sight | NAVGrid | VT60 ILLUMINATOR

Astroengineering and Installations

Brontes | The Crucible | The Forge | The Hub | HMS Marchestra | Astrea Station

Technology related Projects

Project LAZARUS | Project DEEP VALLEY | Project ASCENSION | Project ENIGMA | Project HIDDEN LIGHT | [[]] | [[]]

Other Technology

Multi Purpose Holographic Display | HALO Tactical Insertion Pod | HURRICANE Tactical Delivery Pod | I-45 Scavenger Drone | Inertial Compensator | [[]]

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