Kitaga Genbu-Class floating fortress

The Kitaga Genbu-Class(Yamago: 北方玄武, Black Tortoise) is a massive mobile naval platform constructed and deployed by the Imperial Izumo Navy. It is the largest warship as well as largest surface ship in the world. Thus far two have been constructed. Their main purpose is to transport and support land, aerial and naval forces in the field, but carry a large amount of weaponry and are capable of dealing with surface threats themselves, capable of acting as the ultimate resupply and blockade ship.

Two runways are installed on the Kitaga Genbu-Class, each 335m long and capable of serving both takeoffs and landings. Its interior holds hundreds of storage and staging bays as well as multiple drydock wells for landing craft to depart from. The Kitaga Genbu-Class is so large that movement is hardly felt by the crew and passengers on board, and it is so large that it is commonly referred to as a 'floating island fortress'.

Design
The floating fortress is a massive mobile naval platform designed to support entire armies, air wings and naval squadrons during extended campaigns. The sheer size of the ship means it has to have an unconventional design. It has multiple buoyant hulls beneath the waterline to allow the floating fortress to move with less water resistance, though the speed is still extremely slow, at a mere 16 knots.

The shock and awe factor is also part of the floating fortress's design. As it is such a massive target that cannot be ignored by enemy troops, the design was intentianally made to be impregnable and near-untouchable by enemy aircraft due to a massive amount of CIWS and anti-air weaponry.

Ships in class
Thus far only two Kitaga Genbu-Class ships have been created.
 * IYS Kitaga Genbu currently protects the northern coast of Izumo.
 * IYS Kurogame is currently deployed in the Vorshevsky Strait, maintaining the peace as part of the UN presence in the area.

History
The Kitaga Genbu was the brainchild of one Admiral Yamashiro, who looked for creative new ways to modernise the Izumo Navy. Emerging on the victorious side in World War One, Izumo was flush with money and was ready to begin production of serious new military hardware. The Kitaga Genbu was one of the first projects, built in disguise as an artificial island to increase the land area of Kagoshima Bay but later moved out to sea, where Navy engineers finished installing weapons away from the public eye.

The first Kitaga Genbu, the IYS Kitaga Genbu, was ready for combat by World War Two, and her sister Kurogame shortly after. Blockading the Aegean Strait, Kitaga Genbu was instrumental in halting the USUR advance into Britannian territories.