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The Phallus
OK, I introduce you to the Holy War vessel of Romulan Glory and Vengence, the RGV Phallus. A picture of the Phallus can be found Here
It is 50,000 miles long, armored the same way as my base (Quantum Crystaline, Neutronium and Ablative armor), except that instead of 30 meters thick it is 9 kilometers thick. Click Here for armor detail. The shields are 400 times stronger than the DSII's and are powered by a hypermatter-warpcore, a warp core fueled by hypermatter and anti-hypermatter, which is 50 miles high and puts out more power than 200 DSII reactors. (The shields can still be 400 times stronger, because not all the DSII's power would have gone to the shields, but all this cores power does.) Another HM-WC of similar size and power supplies power to the ship's weapons systems, and a third supplies the various engines and drives, along with general ship systems such as lighting, heating, replicators, gravity etc.
It has a galaxy-gun class hyperdrive, transwarp drive, QS drive, fold drive, and regular warp drive.
It is armed with 20 DSII class superlasers, and also a prototype "superphaser". (If a SL is a scaled up blaster, it should be possible to do the same with phaser tech) This has the advantage of NDFing a planet into nothing, so it does not leave evidence in the form of a debris field, the way a superlaser would. It has 3,000,000 turreted Defiant-type pulse phaser cannons, 1,000,000 HTLs, 3,000,000 MTLs, and 5,000,000 light turbolaser point defence guns. It also has 500,000 Galaxy-class phaser strips. It has 100,000 quantum torpedo tubes, and an equal number of heavy concussion missile tubes, and 50 nova bomb launchers.
In it's bays are a billion TIE avengers, a million Defiant-class starships, a Thousand ISD-IIs, and one Executor-class Super Star Destroyer.
To meet crewing demands, the huge hundreds-of-meters-long replicator pads have been fed the data on T-800 model Terminators, and are replicating tens of thosands of them at a go. The Terminators are of course higly intelligent, completely loyal, and perfect for crewing starships, fighters etc.
The Phallus is equiped with Romulan-style cloaking and phase- cloaking, and currently holds station in a nebula near the Sol system.
Only in a "last resort" situation, would the Phallus make a direct attack itself. The ships it contains and services do the work under normal circumstances.