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Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] How many Super Star Destroyers did the Empire have?
gpt
Of Executor-class Star Dreadnoughts - the class most commonly known as "super star destroyers" - we know of sixteen specific vessels and potentially of more (it is not clear if others are distinct vessels, or ones listed here but simply not mentioned by name).

Overall, Executors tended to live short, bloody lives; they were prime targets for Rebel (and later New Republic) infiltration, were often assigned to heavy-service sectors, and bore the brunt of major battles in which they were involved.

- *Executor* - flagship of Darth Vader's Death Squadron. Destroyed at Endor.

- *Lusankya* - originally named *Executor II*, completed simultaneously with *Executor*. Buried on Coruscant as an escape ship for the Emperor. Fell into New Republic control, expended as suicide bombship at Borleias.

- An unnamed Executor-class was under construction at Fondor when it was destroyed by a Rebel task force.

- *Terror* - equipped with cloaking device. Flagship of Admiral Siam's TIE Phantom project. Destroyed by Rebel sabotage.

- *Vengeance* - flagship of Admiral Wooyou Senn. Allegedly destroyed by impact of 4 Rebel suicide bomb-ships, but reports are unclear. May have survived.

- *Guardian* - flagship of Admiral Gaen Drommel's Coruscant defense fleet. Fell into Rebel control, last seen operational at the Defense of Mon Calamari in 29 ABY.

- *Annihilator* - flagship of Admiral Gaarn. Destroyed at Fondor by combined Rebellion/Zann Consortium fleet.

- *Reaper* - flagship of Grand Moff Ardus Kaine, later Admiral Gilad Pellaeon. Destroyed by Rebel task force at the Battle of Celanon, in large part by duel with the captured *Lusankya*.

- *Iron Fist* (originally *Brawl*) - flagship of Admiral Zsinj. Destroyed at the Battle of Dathomir by combined New Republic/Hapan force.

- *Night hammer* (later *Knight Hammer*) - advanced model with reduced crew requirements and some stealth measures. Flagship of Admiral Natasi Daala. Destroyed at Yavin by massive Force action by multiple Jedi and sabotage.

- *Intimidator* - advanced model with improved shielding. Captured during Yevethan uprising where it was known as *Pride of Yevetha*; later recaptured and returned to Imperial service. Later discovered apparently abandoned, presumably as the weakened Imperial Navy could not support such a massive vessel.

- *Aggressor* - flagship of Admiral Roek, later Grand Admiral Josef Grunger. Expended in suicide ramming attack at Corellia.

- *Enforcer* - flagship of Admiral Kohrin. Destroyed at Phaylenn by Rebel forces while powered down and undergoing repairs from earlier combat.

- *Razor's Kiss* - scuttled at Kuat Drive Yards while under construction by Admiral Zsinj rather than allow a Rebel force to potentially seize it. Wreckage was later used to create *Second Death*, an illusory and nonfunctional "mock Executor".

- *Whelm* - part of Coruscant defense force; destroyed in battle by New Republic force over Alsakan.

- An unnamed Executor was used by the Imperial agent X1. It was destroyed at Mustafar by Rebel sabotage and incompetence, causing collision with the planet's planetary shield.

Lastly, it should be noted that there were many other classes of Star Dreadnought; Executors were simply the most well-known of the lot. Some were very much the military equal of an Executor; *Whelm* was destroyed by a duel with the Mandator III-class Dreadnought *Panthac*.