Just for a rough power level, it's 8km long, its 2 wave motion guns can shatter a planet, it has a massive flame strike gun that basically rips matter off the reactor and fires it at the enemy, able to tear through a dozen star destroyers at once, it has 2 ion pulse cannons, 6 super heavy and 4 ultra heavy plasma lances, enough to cripple an executor 1 and deal decent damage to an executor 2, 2 super heavy megamaser beam cannons, Chiss technology gained through an alliance, 4 massive triple beam turrets powered by the 2 quantum cores which are black holes held in stasis, (the hawking radiation is used as a power source, it also has antimatter reactors and wave motion engines which dwarf both in power output but are considered somewhat risky to run) and are able to sweep through imperial fleets destroying upwards of 16 star destroyers at once. 2 quad turrets carrying 2 compression particle beams, even more powerful than the triple turrets per hit but on a shorter beam time and longer reload, high penetration weapons to take on executors and 2 collapsar cannons, which are a plasma cannon that fires a super highly compressed sphere, able to easily 1 shot even an ISD2 and all 4 can cripple or outright disable anything short of an executor 2. 72 super heavy fusion cyclers (burst super heavy plasma cannon but higher energy plasma, fusion reactors are dedicated to them, massive damage capability), are mounted in 18 quad turrets along the angled side of the bow and 96 plasma torpedo launchers (similar to the halo one but much more powerful, 10 shot burst of guidable, super high pressure plasma bolts) are mounted in 24 quad turrets on the wings, 52 super heavy plasma sphere launchers (50 reloads each) are mounted internally, acting as missile tubes, it carries 20 autoloaded heavy bow torpedo tubes able to fire 5 rounds in 8 seconds and 2 100 tube super heavy VLS systems and 600 heavy plasma cannons (roughly equal in firepower to 5400 super heavy turbolasers or 1800 super heavy pulse cannons, the imperial successor to the turbolaser (the presence of a rival power creates an arms race)) mounted in 75 octuple turrets scattered across the ship add some rapid fire weight to its volleys. 750 pulse laser point defence and 250 ion point defence make up its defensive batteries. Airwing of 1600 consisting of 800 thunderbolts (basically BAE systems tempest crossed with the pan spatial Killswitch and the cosmo python, makes the TIE defender elite look like a basic TIE by comparison) that provide the bulk of the airwing as all purpose aircraft, 400 fang class providing excellent escort and defensive capabilities to defend the ship and its bomber squadrons from enemy fighter wings and 400 C712 longswords as heavy bombers capable of shattering star imperial 1 star destroyers, later replaced with the much more powerful VJ 200 Beskad class as the TIE intercepter was phased out in favour of the TIE defender elite. It would take too many words to go into the defences so I'll sum them up: immensely tough shields, 20 metres of Beskar and cortosis reinforced nanolaminate, hard light shields and parry shields and a migobueza coating, which renders it almost immune to laser weapons and can provide significant defence against turbolasers. A wave motion shield which renders it all but immune to conventional weapons but strains the reactor and has limited operating time and a nanomachine based self repair system. All technology that wouldn't become standard for another 22 years. This thing is designed to be the symbol of Mandalore, it's painted black and gold with 2 giant golden mythosaur skulls. It is not designed to rival an executor, it is not designed to rival an eclipse (in my universe the executor 2 is better than an eclipse, with a similar bow gun and much better everything else) it is designed to rival a death star, and though much smaller, the cost is pretty similar.

For a round idea of what it looks like search up bishamonten class assault cruiser, imagine that but the wings have an ion pulse cannon in the front and a massive triple turret on the top and bottom, the beam weapons are in the various bow prongs, lances and megamasers in the split upper prong, wave motion gun in each lower prong and the flame strike gun firing from between the prongs. Also black and gold, golden mythosaur skulls on the sides.

For anyone annoyed at the amount of words: I have 150,000 words of this universe, this is the watered down version of 1 ship, the doc that details naval tech and each ship class is over 50k words, I did my best but it's hard to compress so much lore.

The spirit of vengeance will eventually be destroyed after being dragged out of mothballs to lead the defence of Mandalore during the pivotal battle of the Infinite order war in around 22 aby, more than 38 years after it was commissioned, though it would be far less powerful when commissioned around 16 BBY than the stated armament, only the plasma and missile weapons would be carried at launch, most of the rest would be added in 2 major refits in 6 and 1 BBY, adding wave motion and particle cannon and hard light tech respectively, while the Thunderbolt and Beskad wouldn't even be available until around 3 aby. Following the loss of its replacement which would be suicide rammed into an infinite order superweapon to save the planet garmillas. The spirit of vengeance would be destroyed in the battle by concentrated fire from particle cannon armed resurgent class star destroyers, it would be temporarily replaced by an appcalix class supercarrier, the one from Space Battleship Yamato, before finally being properly succeeded by the spirit of victory class battlecarrier shortly before the Yuuzhan vong war.

Venators are beautiful and it is a Star Destroyer - the Video didn’t say Imperial Star Destroyers