MESS-S1bB-007 Domino IV

Technology and Combat Characteristics
Despite being a mainline Heavygun in its classification, the Domino IV has a pair of hydraulic gauntlets, which would go on to inspire development of the Saturn. This allows it, similar to the Artillery, to operate at close, medium, and even long range combat.

Armaments
Domino is a Garrisai versatile in ranged combat, being equipped with a pair of 300mm Coiled Railguns, similar to the Ballista. Other than that, the mech can take on its alternate mode, the Mobile Domino. In this form, it gains a version of the HMT System, a pair of Swarmfire missile launchers, and miniguns mounted in each of its forearm gauntlets. The gauntlets themselves hold hydraulic gauntlets that extend the fists of the mech, giving them a powerful melee attack.

Special Equipment and Features
The Chest Impulse Cannon, similar to the previous three Domino units, features a retracting high-powered Cannon that equals the output of almost twice that of the 300mm Coiled Railgun. It is concealed behind a set of double doors, and protrudes from the chest when used.

History
Domino IV is the final model of a discontinued project aptly called the Domino Project. The idea of the project was to create a compact and self-sufficient version of the Solar Cannon, as to make it easier to move around the battlefield. In order to do this, however, the machine would require two Fusion Drives that had to run in parallel operation, which then had to accelerate fast enough to charge the chest-mounted Cannon. The problem with this system was that, as time would tell, the amount of energy needed compared to the amount being fed into the unit was too much for its frame to handle.

Both Domino units I and II had problems spinning up the Fusion Drives at identical speeds, resulting in a catastrophic explosion. The third unit was able to fire the weapon for a limited time, but it would short circuit within seconds of firing, causing the Fusion Drives to overheat and incinerate the pilot. This was because the cockpit was right under the Cannon itself, and right in front of the Fusion Drives.

After realizing that the weapon would be far too dangerous to use, the scientists of the Domino Project resorted to switching the Cannon’s projectiles from Reactor-charged lasers to conventionally powered Railguns. Despite having a lower stopping power compared to the original designs, it was safe to use. The Domino IV would continue operation as a standard Unit, similar to that of Heavyguns such as The Artillery and Dreadnought.

More history on Domino IV and the Domino Project here.

Trivia
- The Domino has a head design inspired from Vah Naboris of BOTW, as well as a domino, which it was aptly named after from its six head cameras. - Its first established appearance came from a scrapped poster for the 4-person team of Harbinger-2584. It was intended to be piloted by Connor Harlen (or John Harbin at the time). This is referenced with Legacy's Connor Holland assisting in the creation of the Solar Eclipse--the machine the Domino IV was developed into.