I've seen alot of suggestions about flagships and such but no real bonuses for them, so here is my suggestion.



Have 5 new hull designs, corvette, Destroyer, Battleship, Dreadnaught and Mothership.



You can have a limit of 4 Corvettes, 3 Destroyers, 2 Battleships and 1 Dreadnaught and Mothership class flagships or fleet leaders.



You can design them like any other ship of the class but there will be a research for special support mods, that in turn give a bonus to the fleet, each class will have they're own set of modals that give different bonuses, But thees ships will have more tounge then the base ship of the class and higher hp and such, something that can pretty much help turn the tide of battle, tho each fleet would be limited to a number of OCP (Officer Command Points) witch would be separate from the fleets CP.



Modals can range any where from bonus to defenses, or weapons, fleet movement, battle actions, extra xp for fights, more sight range or even add a new battle action all together.





Now the mothership would be of course the biggest ship of any other class, this might even be a way to incorporate fighter wings, allowing hangers on the mothership, also allowing us to completely customize the mothership to our liking.



When we enter the fleet screen and go to make a new ship design, you pick the mothership frame and then instead of just bringing up the normal mods it brings up the subsystem menu, where you pick from a list of Subsystems to install on the ship it self, each one would give different bonuses to the design and after you could then install the normal mods.

Bigger shiptypes (including flagships&deathstars) have already been suggested here: /#/endless-space/forum/28-game-design/thread/11812-add-bigger-ship-types-to-exploration-and-expansion

Strikecraft/carriers have been suggested here: /#/endless-space/forum/28-game-design/thread/11783-strikecraft-fighters-bombers-and-corvettes-in-es



Your mothership basically seems to be a mix of those.

Therefore the suggestion has been linked to both threads and is moved to the archives.