The top view concept for the Black Iris, the main flagship for Arahi resistance forces in their campaign against the Anti-Magic Faction. I took inspiration from various amphibious and submersible units including the I-401 from Arpeggio of Blue Steel, the Red October, and the Tuatha de Dannan from Full Metal Panic.
Length: 328 m
Beam: 152 m
Height: 88 m
Displacement: 52,400 t
Propulsion: 5 x Gravity Drives, 1 x MHD Drive
Top Speed: ~50 knots (surfaced), ~80 knots (submerged)
Complement: 4,800 min, 8,000 max
Vehicles carried: 150 (ground vehicles and aircraft included, maximum)
The project goes back to when Arahi was still a wretched hive with a corrupt government. The project was monitored in secret by General Ishida, the top commander of the Arahi military, using technology from the legendary Typhoon-class submarine and constructing it in an abandoned shipyard. The original purpose was to serve as a mobile command base and emergency transport for personnel in case Arahi fell to total anarchy. During the civil conflict that later transformed it into the stated magical girl haven, some of the magical girls were recruited into the military for the sake of this project. Thanks to their abilities, they manage to not only accelerate its construction but also modify it to exceed all original expectations. After the AMF and its associates invaded the island, the Arahi military personnel evacuated in this vehicle undetected, using it as a mobile base in their campaign to reclaim their home island.
The Black Iris operates with a combination of both magic and normal-based technologies. Most of the hull is composed of a strong Magnesium alloy and enveloping nanotubes, making it nearly half as heavy as ships its own size while retaining high durability and stealth. The main engine is a large Mana Core, made from modifying its original spherical fusion reactor. This endless stream of power allows it to stay operational indefinitely as long as it constantly receives other supplies elsewhere. Regarding propulsion, it has a perfected MHD Drive (magnetohydrodynamic) for traveling underwater without detection. However, recent modifications also gave it five Gravity Drives (four at the bottom and one below the MHD Drive), magic-based propulsion systems that allow it to travel above water and remain airborne. When underwater, it seals up the rear section to the rear deck and its two Deck Cannons from water.
Besides its large arsenal, it also carries a significant complement of personnel, vehicles, and aircraft. Some can launch from its missile and torpedo tubes but are mainly launched from either its rear deck or the Force Catapult in the front.
* 12 Torpedo Tubes
** 4 x Front
** 6 x Side
** 2 x Rear
* 14 x Large Missle Tubes
* 64 x Small Missile Tubes
* 2 x Deck Cannon
Triple-barrelled turrets, one above and one below the rear deck, that fire either normal-based rounds or magic-based energy beams. These are concealed along with the rear deck when underwater.
* 24 x Bullet Globe
Crystal-clear half-globes that are magic-powered Close-In Weapons Systems. Each fires energy bullets at incoming targets or can overcharge to fire homing beams.
* Hyper Purification Weapon
Also called the "Purifier," it is the most powerful weapon on the machine. The Purifier is a number of circular plates engraved with Maxine's runes stored on the front of the machine. To fire the weapon, the ship must reveal it from the nose. The smaller plates would arrange themselves around the large plate (about the diameter of the sub's nose) and charge for a long period of time before firing. Also, to avoid damage from the recoil and flash of the blast, it is required to have the Gravity Drives push the sub forward, tint the windows, and give crew members goggles or glasses fit for a solar eclipse.
Fortunately, this is done with the Purification Weapon at full power with maximum damage intended. The engraved runes were programmed to lower the power output and damage if needed, as well as hitting only magic-based targets rather than including normal ones.
* Cloaking Field
When stealth is necessary, the Cloaking Field can shield the machine from most sensors and human eyes. The only sensors capable of finding the Black Iris when cloaked are sensors that detect magical energy residue.
* Mana Shield
A magic-based energy shield that envelops around the Black Iris when activated, preventing unwanted entities from passing through, whether they are entering or exiting the sub. The shield is vulnerable to EMPs and will deactivate after absorbing too much fire.
* Assembly Matrix
The warship's personal machine shop, stored within the hangar storage. Products include lost parts, equipment, ammunition, and new vehicles.
* Force Catapult
Hiding behind the engraved plates of the Purification Weapon. The large engraved plate can open itself into quarters and activate the Force Catapult to launch its complements. This is also the main intake of ground units at a port or coastline.