Two 300kt ships: a superdreadnought and a "fighter base", only ever built one of each and they both have two 100kt special escorts.
They're both the flagship of their own little armada, but not all that strong by themselves. They both carry jump engines which take up a good 10% of their size to jump with up to six other ships simultanously, dedicated another 20% to engines for a whooping 7002 km/s and they have shields comparable with a star swarm queen plus 30 (carrier) and 50 (dreadnought) layers of armour. Their offensive capabilities aren't as good as when I first thought them up, but they proved to be excellent meat shields (and therefor got their two escorts, one support and one missile platform) and 'normal' fleet ships.