Welp, here goes... Likewise for me there are not a lot of hard-and-fast stats out there about this particular ship so I'll do my best.

[hider=Vengeful Spirit]
[b]Name of Ship:[/b] Vengeful Spirit

[b]Home Universe/Name of Franchise: [/b] [url=https://wh40k.lexicanum.com/wiki/Main_Page]Warhammer 40,000/The Horus Heresy[/url]

[b]Ship Class:[/b] [url=https://wh40k.lexicanum.com/wiki/Gloriana_Class_Battleship]Gloriana-Class Battleship[/url]

[b]Role:[/b] Flagship/Fleet Command

[b]Physical Description/Image:[/b] [url=https://wh40k.lexicanum.com/mediawiki/images/c/ce/Vengefulspirit.jpg]Image Link[/url]

[b]Physical Size (roughly):[/b] Approx 20 km from bow to stern.

[b]Armament/Complement (roughly):[/b] The [i]Vengeful Spirit[/i] is armed with [url=https://wh40k.lexicanum.com/wiki/Magma_Bomb]magma-bombs[/url] and other [url=https://wh40k.lexicanum.com/wiki/Macro_cannon]macro-cannons[/url] for orbital bombardment, a bow-mounted [url=https://wh40k.lexicanum.com/wiki/Nova_cannon]nova cannon[/url], broadsides bristling with [url=https://wh40k.lexicanum.com/wiki/Lance]energy lance[/url] weapons, a full complement of [url=https://wh40k.lexicanum.com/wiki/Torpedo]plasma-fusion torpedoes[/url], and various point-defense weapons such as flak cannons and automated turrets. Additonally, as the flagship of a Crusade expeditionary force, the Vengeful Spirit carries a full six companies of [url=https://wh40k.lexicanum.com/wiki/Space_Marine_Legion]Astartes[/url] belonging to the [url=https://wh40k.lexicanum.com/wiki/Sons_of_Horus]Sons of Horus Legion[/url], including air and armor support, drop pods, and boarding craft.

[b]History of the Ship:[/b] The [i]Vengeful Spirit[/i] is an ancient ship built under specifications that predate the Imperium of Man, its early history reaching into the darkness of the Age of Strife. With few of the monumental Gloriana-class ships in operation, those under the control of the Emperor of Mankind were divvied out among his sons, the superhuman Primarchs. Horus Lupercal, being the first and foremost among the Emperor's sons, was given the Vengeful Spirit to serve as the flagship of his legion. Under the command of the Warmaster, entire worlds have fallen, and enemy fleets have surrendered outright upon the sight of the massive battleship. 

[b]Notable Crew:[/b] [url=https://wh40k.lexicanum.com/wiki/Horus_Lupercal]Horus Lupercal[/url], Warmaster of the Great Crusade, Primarch of the Sons of Horus
Ezekyle Abaddon, Sons of Horus First Captain
Maloghurst, Equerry to the Warmaster
Tarik Torgaddon, Sons of Horus 2nd Company Captain
Horus Aximand, Sons of Horus 5th Company Captain
Garviel Loken, Sons of Horus 10th Company Captain
Falkus Kibre, Sons of Horus Justaerin Terminator Captain
Kyril Sindermann, Iterator Primus
Regulus, Envoy of Mars

[b]Unique Technology:[/b] [url=https://wh40k.lexicanum.com/wiki/Warp_drive]Warp Drive[/url]
[url=https://wh40k.lexicanum.com/wiki/Void_shield]Void Shields[/url]
[url=https://wh40k.lexicanum.com/wiki/Gellar_field]Gellar Field[/url]
[url=https://wh40k.lexicanum.com/wiki/Teleportation]Teleportation Matrix[/url]

[b]Crew Size:[/b] Crew compliment of approximately 600,000, including naval staff, security, and Mechanicum adepts.

[b]Faction/Operator/Owner:[/b] The Imperium of Man/Astartes Legion XVI, the Sons of Horus/Primarch Horus Lupercal

[/hider]