Allegiance-class Star Destroyer

The Allegiance class is present only in heavy fleet concentrations. Incorrectly named "Super Star Destroyer" by the rebels, the ASD is known in the imperial navy as a "heavy star destroyer" or simply "destroyer-killer", which aptly fits the specifications of the ASD. At nearly three kilometers in length, it is five times the mass of a regular Imperator-class Star Destroyer with heavily armoured superstructure. Ten times the power output feeds twice as many weapons and almost two and a half times stronger shields, all with much improved recharge rate. The ASD is fit for use as a command ship with its extended CIC functions, long-range sensors and powerful EW suites. Ref note: This ship is not 2,200 m long.
This class was provincially named after the first known ship of the type.
Picture courtesy of Warlords

Specifications:

Name/Type: Allegiance-class Star Destroyer
Designer/Manufacturer: Kuat Drive Yards
Designation: Large Cruiser
Crew: 55,133, 450 gunners
Length: 2,800 meters
Speed: 70 MGLT
Hyperdrive: x1
Shield Rating: 11,520 SBD
Hull Rating: 7,660 RU
Weapons: 100 Heavy Taim & Bak Turbolaser Batteries, 50 Taim & Bak Heavy Turbolaser Cannons, 20 Warhead Launchers, 50 Borstel Ion Cannon Batteries, 15 Phylon Tractor Beam Projectors.
Fighter Complement: None.
Troops: 5,500 Stormtroopers.
Support Craft: 10 Lambda Class T-4a Shuttles, 2 TIE Shuttle Craft.
Modifications: MISS Point Defense System