Kalran: Tales of the four nations/Mothership

The Mothership is the main base of the ADF, building all of the ADF structures, defense, and gather resources.

Tactical analysis

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History
With how small the ADF forces are they don't need large forward bases. Instead using what they call the Mothership, an atmospheric spaceship, to command their forces on the ground.

From their special, low earth orbiting, fortress, the Oread Fairy, ADF forces on duty lives and trained, and once called into battle through the Mothership's highly advance communications array they will be brought onto the battlefield through heavy-duty dropships, but due to spacing, they require dedicated structures for their forces to land.

The ship itself also contains enough basic weaponry to ward off all but the most spirited assaults and a redundant system built in so that the ship needs to be destroyed three times to officially kill it.

But with all of its expensive technology and equipment means that only one Mothership can only exist on the battlefield and the loss of a ship, until the commander gains clearance to call in another Mothership, will force the ADF to cut their losses and retreat.

Rank upgrades
Rank 1:

Rank 2:

Rank 3:

Rank 4:

Upgrades
Due to the Mothership being responsible for all of the ADF research they will be separated into their own branch

Sword

Bow

Spear

Weapon Modules
Once the Mothership reaches tier 3 full access is granted and the commander will be able to equip their ship with up to four modules, which can either support their forces, wreak havoc on their foes, or somewhere in-between. Which are split into primary weapons, secondary weapons, and support systems, each requiring research in the Sword, Spear, or Bow branch to upgrade their modules, though some modules can take up to three module slots. Modules can be switched, but it takes time during which it's vulnerable.

Primary Weapons
Long ranged and powerful. Primary weapons are built to blast their foes apart from long-range with siege-based weaponry, though many of them have a large minimum range and slow rate of fire, meaning such "siege ships" are helpless when the enemy closes in. Requires Sword to upgrade.

Secondary Weapons
Built to engage at medium to close range. Secondary weapons are built to provide heavy fire support and defense to their forces, but the range of their weapons means that long range units and defense can hit these "guardian ships" with ease. Requires Spear research to upgrade.

Support Systems
Built to support their forces. Support systems are built to provide support to their surrounding forces, whether by intercepting projectiles to creating a forcefield. But none of their weapons can directly damage their foes, thus these "protector ships" tend to be helpless without allies. Requires Bow research to upgrade.