The BST-Frame, also known as Beast Frame or BST, is a type of war machine in Armor Blitz Online.
The BST-Frames, originally named Fallen Angels, were specialized war machines dedicated to defeating Prophets during the Cataclysm War. The first Fallen Angel was developed following the first successful defeat of a Prophet in combat, taking material from its corpse to develop the first Fallen Angel. Although it took the entire corpse to produce just a single frame, the first Fallen Angel proved to be an extremely effective weapon, with weaponry and performance capable of countering the abilities of a Prophet. As more Prophets fell, more Fallen Angels were produced, with more being able to be built off of single corpses from refined manufacturing processes and more streamlined frame designs. The Fallen Angels would turn the tides of war in humanity's favor, resulting in the complete destruction of the Prophet menace and a decisive victory of the Cataclysm War.
All BST-Frames have a humanoid appearance, though aside from this the appearance of those uncovered have varied wildly, although they all share an identical base frame upon which all else is attached. Additionally, despite the similar naming convention as Armor Blitzes, the BST-Frames bear no similarity to them aside from their humanoid shape. They are demonstrably superior to the Armor Blitz in every conceivable way, being faster, more powerful and more durable. There are several distinct characteristics that distinguish a BST-Frame from an Armor Blitz, being the following:
Integral Weaponry - All BST-Frames all carry their weapons internally and integrally, as opposed to the modular external weapons the Armor Blitzes carry. This results in the BST-Frames having a base repertoire of weaponry that are built into the frame, and nothing is stopping them from carrying additional weaponry externally.
Energy-Based Weaponry - All BST-Frames utilize energy based weapons as opposed to the projectile and physical weapons the Armor Blitzes use. Energy blades and energy-based ranged weapons are commonly seen on BST-Frames.
Emphasis on Close Combat - All BST-Frames carry at least one energy blade, and are capable of engaging in fast-paced close-quarters combat. Whereas Armor Blitzes rarely carry a melee weapon unless as a last resort, the BST-Frames feature extremely high performance in close-quarters engagements, with their energy blades providing an extremely powerful weapon to use up close.
Flight Capability - All BST-Frames are fully flight capable, while Armor Blitzes are relegated to the ground without the use of a Flight Unit, and even with one they are incapable of full flight, only being able to hover and glide some distances or use them to reach advantageous positions. The BST-Frames all feature wings of some kind on their backs, as well as additional boosters on the legs and/or feet, providing exceptional speed and maneuverability in the air. BST-Frames are easily capable of breaking the sound barrier while in flight.
Pilot Link - All BST-Frames feature what is known as a Pilot Link, which uses biometrics to link a pilot to a single frame, with only that pilot being able to operate the frame from then on until the link is overwritten. The purpose of the Pilot Link is to allow for a greater degree of control and synchronicity between the pilot and the frame, and as the Pilot Link strengthens, the effectiveness of the pilot and the frame rises while at the same time the link between the two becomes harder to override. A strong Pilot Link allows for the full ability of a BST-Frame to be realized, along with perfect synchronicity between pilot input and frame output. The Pilot Link effectively makes the pilot into the key that can activate the frame, and nothing will make the frame move without that key. Further, the Pilot Link facilitates the BST-Frame's ability to act autonomously, essentially following the will and intentions of the pilot themselves. The BST-Frame will continue to carry out that will even if the pilot is disabled in some way, such as being rendered unconscious. With a strong enough Pilot Link, a pilot is capable of piloting a BST-Frame without even touching the controls, or even when outside the cockpit.
All BST-Frames currently uncovered possess what has come to be known as an Absolute Defense Field, or AD-Field, an ability inherited from the Prophets they were made from. The degree to which an AD-Field is manifested can vary, and the properties of the field are not currently understood, as the field seems to defy current scientific knowledge. In essence, the AD-Field is a barrier that has the ability to defend against all current weaponry with no effect, and seems to be the BST-Frame's primary method of defense. As the entirety of the BST-Frame is made of the corpses of Prophets, the source of the AD-Field comes from the entirety of the frame itself and not any single power source. As such, the power of an AD-Field can be weakened by removing parts from a BST-Frame, as the AD-Field will have less space to manifest over. Additionally, this means that generally larger BST-Frames have stronger AD-Fields.
The BST-Frames carry a function called the HALO System, or The Beast. This allows them to exceed their normal combat performance parameters by exponential amounts, allowing them an unrealistic degree of combat performance that is capable of destroying even F-Armors with ease. The system is designed to detect Prophets and automatically activate in order to destroy the enemy as quickly as possible and with extreme prejudice.
In modern times, the system has only been activated once in BST-02, where it went beyond the ability to control and had to be torn apart to deactivate, resulting in the near total destruction of an entire city, in an event known as the Cardaca Incident.
Among BST-Frames, a subsection of frames carry physical weapons. At first these types of frames were thought to be earlier iterations of the machines before energy weapons were developed. However, the opposite is true, as these machines are not only capable of easily dispatching Prophets, but were also made to defeat and destroy other BST-Frames. This was due to the fact that after the Cataclysm War, many BST-Frame pilots turned on humanity in order to carry on the unknown purpose of the Prophets, utilizing the BST-Frames in order to do so and resulting in another worldwide conflict. With most BST-Frames being evenly matched, the war was effectively at a stalemate from the start, with battles being decided mainly by pilot skill. However, in response to the pilot rebellion, a new type of BST-Frame was created that utilized physical weapons in order to more easily break through a BST-Frame's defenses. These frames were known as Executioners.
Although produced in very small numbers, the Executioners proved to shift the balance of power, with the specialized frames being easily able to break through the defenses of enemy BST-Frames and tear them apart brutally with their physical weapons. With the introduction of these frames, the new conflict came to a swift end.
The Executioners are mostly consistent with previous Fallen Angels, but differ in a few important ways:
Burst Weaponry - All Executioners feature powerful burst weapons that act as trump cards to instantly destroy other BST-Frames. These weapons are usually the key distinct feature of an Executioner, and are extremely powerful single-shot weapons that most of the time outright destroy their targets instantly, though usually require specific situations in order to use effectively. This can vary from trapping the target first or initiating a surprise attack from an advantageous position.
AD-Field - The AD-Field of an Executioner is distinctly more powerful and effective than the already impressive fields present on other BST-Frames. Executioners are able to bypass the one weakness of nullifying AD-Fields, in that matching the frequency of an enemy AD-Field not only weakens the enemy AD-Field, but both AD-Fields present, exposing both frames to danger. The Executioners are designed to negate this weakness, and instead of using the normal method of nullifying AD-Fields, they are instead able to outright destroy enemy AD-Fields with the force of their own. They achieve this by being able to manipulate their own AD-Fields in ways that normal BST-Frames cannot, essentially weaponizing the AD-Fields as a means of attack as well as defense. Skillful use of the AD-Field in this manner can result in an extremely powerful, unpredictable, and undefeatable weapon that can not only immediately destroy opposing AD-Fields, but can easily rip apart whatever is behind it.
AD Burst - All Executioners are capable of what is known as an AD Burst, in which the Executioner releases all the power of their AD-Field at once in an extremely powerful burst that most of the time destroys whatever it hits if it is not properly protected. It is mainly used to instantly destroy other AD-Fields, and is normally deployed when an Executioner is in combat with multiple other BST-Frames in order to instantly remove their protection and then move in to quickly eliminate them. While an AD Burst is capable of instantly shattering other AD Fields, it also destroys the Executioner's AD Field, rendering it unusable for a limited time, leaving itself vulnerable in order to open up an opportunity to destroy its target.
The Beast - All Executioners possess a secondary mode for The Beast, which activates in the presence of another BST-Frame with its HALO System active. This function further increases the power output of the HALO System beyond that of a normal BST-Frame, changing the color of the glowing frame beneath the split armor segments and facilitating the use of the Executioner's AD-Field for offensive combat. This allows an Executioner to break through a BST-Frame's AD-Field even if The Beast is active, ensuring that the Executioner cannot be overpowered. Additionally, the Executioner's jaw will unlock and allow its mouth to open, allowing it to unleash a powerful scream or howl, which is mainly used to intimidate enemy pilots and decrease their combat effectiveness with their frame, while also causing some disruptions to electronics.
Psychological Warfrare - The Executioners are all designed to appear more bestial, usually with sharp contours and angular surfaces in order to intimidate and strike fear into enemies with appearance alone. This is further emphasized by the way the frames are designed to move and the ways they are meant to engage in combat, emphasizing brutality and intimidation in both movement and combat. Moreover, the function of the jaw unlocking during an Executioner's secondary Beast form allowing it to emit its loud scream reinforces this. The purpose of these fear tactics is to disrupt the Pilot Link of the enemy BST-Frame, thereby causing a drastic decrease in performance and effectively rendering the enemy defenseless. As the Executioners were designed to destroy other BST-Frames, emphasis was put not only on making sure the machine could dominate an opposing BST-Frame, but whoever was piloting it as well.
The original names of the BST-Frames has been lost to history, and each BST-Frame is named based on the order in which they are discovered, and follow the naming convention of BST Phase XX, or BST-XX, starting from 01 and proceeding linearly from there. Any individual personal names can be given by anyone, be it the nickname the ones who discovered it gave it, or the name a compatible pilot gives it. Generally whatever sticks goes as far as personalized names is concerned.
The first BST-Frame recovered, though certainly not the first one ever built. It was deployed in combat during the Cardaca Incident where it engaged BST-02 while The Beast was active. BST-01 sustained heavy damage from the fight, but succeeded in halting BST-02's rampage. BST-01 has since been repaired - though limitations in technology and research prevented it from regaining its full combat capabilities - and is the only BST-Frame that is on standby for actual combat deployment, as all other BST-Frames discovered are immediately quarantined.
The second BST-Frame recovered and the first to activate The Beast in the hundreds of years after the Cataclysm War. The frame quickly went out of control and seemed to act on its own accord even with the pilot trying to control it. BST-02 was responsible for what came to be known as the Cardaca Incident, where the entire city of Cardaca was brought to ruin in the attempt to get the frame back under control. BST-01 was deployed against it, as all other means of combating it proved ineffective, and BST-01 successfully defeated BST-02 by effectively tearing it apart until it stopped moving. Since the Cardaca Incident, because of BST-02, all BST-Frames uncovered from then on are immediately quarantined upon discovery. BST-02 itself remains in its destroyed state, as the technology and resources required to put it back together and reactivate it currently does not exist.
The seventh BST-Frame recovered, piloted by Walter Fletcher. Features distinct energy claws as weapons on its arms and legs, allowing for all four limbs to be used in melee combat, providing for an unrelenting close-range assault.
The eighth BST-Frame recovered, piloted by Setsuna Nobuyuki. Excels in long range combat, featuring a multitude of ranged weaponry supplemented by a single energy blade.
The thirteenth BST-Frame recovered, piloted by Aika Haseo. The Fenrir is an Executioner designed with physical weapons in order to destroy other BST-Frames as well as Prophets.
The repaired and upgraded version of BST-13 Fenrir.
The sixteenth BST-Frame recovered, piloted by Aruto Kasai. Another Executioner, this BST-Frame prioritizes close-range combat and obliterating its enemies with a point-blank beam blast, whether they be Prophets or rogue BST-Frames.
The upgraded version of BST-16 Muramasa.