Dracropolis (ex-Jupiter) juggernaut

The Dracropolis is the first-and only-ship of the Jovian-class star juggernaut. It dwarfs every Imperial ship ever built (not counting the Phalanx, whose construction predates the Imperium). In fact, it is more of a mobile base than a true battleship, lacking any form of tactical mobility (other than slowly moving towards its target area).

Constructed above Jupiter before the Grand Crusade, the Jupiter (its intended name) was never finished. The Tech-priests of Mars simply lacked the templates and technical abilities needed to complete such a massive undertaking. The project was abandoned, but it taught Mars an important lesson regarding the optimum size of major warships. This in turn led to the Gloriana-class of super dreadnoughts, which became the largest class of warship to be produced in some numbers (the three Abyss-class ships-including the Verbum Finalis-are bigger, but also have some size-related flaws).

During the Great Crusade, much lostech was recovered and the Adeptus Mechanicus's ship-building proficiency improved considerably. This led to the Jovian project being restarted (which in turn sparked the Abyss project). After many delays and endless problems, the ship was made spaceworthy and launched, but shortly before it was due to be commissioned, it was seized by traitor marines of the Granite Guard. The Jupiter was never heard from again-it is believed to have suffered catastrophic warp drive failure during its escape from the Sol system.

Astartes Assault Cruisers (CA)

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Astartes Assault Cruisers fulfill a role somewhere between a Strike Cruiser and a Battle Barge. They are larger, and better able to withstand the punishments of the line of battle, but slower and more cumbersome than their smaller brethren. They can comfortably launch two full companies worth of Astartes against any opponent, and like the CS can carry many more Space Marines if acting as a troop ferry.

Dragon-class: These ancient vessels are patterned after the Salamander's Ebon Drake, the first Assault Cruiser ever constructed. The Ebon Drake left Mars shortly before the Heresy started. It sported many systems now considered archeotech. Ships laid down after the Heresy are but pale copies.

Ravn-class: The Space Wolves have adapted the Dragon into the Ravn-class. It packs powerful battery broadsides, lances, bombardment cannons, and vast launch bays. Speed is nothing to write home about, slower than the original, but the Ravn is tougher than it has any right to be.

Astartes Strike Cruisers (CS)

The term Strike Cruiser (CS) applies to an entire type of ships - it's not just a single class. Just as Destroyer is a type of ship and the Cobra Torpedo Destroyer is a class. In this day and age, Strike Cruisers are almost exclusively used by the Astartes. They are potent warships, about the size of a Light Cruiser of the Imperial Navy. Regardless of class, they feature a heavily armored spaceframe, with ample shielding and powerful engines. 

Armament is relatively light and optimized for ship-to-ship boarding actions and planetary assaults rather than fleet battles. Strike Cruisers almost always have teleportariums, boarding torpedoes, and drop pods. Most classes also have large hangar bays, with Thunderhawks being favored.

A strike cruiser can comfortably support a full company of Astartes, with all the vehicles and support craft they might need. It's possible to cram one or two additional companies aboard, but these will then be without vehicles and support craft of their own.

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Scutum-class: The Scutum is perhaps the most common class of Strike Cruiser. It has much in common with the Spatha, including the bombardment cannon and launch bays, but drops lances in favor of better battery armament. Shielding is superb for a vessel this size. 

Spatha-class: The Gladius-class Attack Frigate's big brother. Its forward quarter is dominated bombardment cannon and cavernous launch bays for its large complement of Thunderhawks. It packs two forward-firing lances for ship-to-ship combat, and light batteries port and starboard. 

Vanguard-class: The Vanguard-class is a relatively uncommon variant that has been optimized for fleet combat, which can be seen as odd for a ship type never intended for this purpose. It drops the bombardment cannon altogether to pack twin lances, good battery broadsides, and excellent point-defense system. It's even more nimble than other Strike Cruisers.

Onager-class: The Onager is a rare class of Strike Cruiser. Its forward quarter is dominated by a massive Nova Cannon, a weapon more commonly found Mars-class battlecruisers. Because of the size of this weapon, the Onager has no launch bays or lances, and only a light battery armament. Like all Strike Cruisers, it's quick and agile for its size, but its shielding is sub-par.

Ships of the Stigmartus

The following non-STC ship patterns are being seen with the Stigmartus raider fleets:

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Black Dart: Raider-class (RR) vessel, about the same tonnage as an Imperial corvette. Looks a bit like a Claymore, without stub wings and an arrow-like prow of darkest hell-forged steel. Extremely fast, decently armored for its size, but practically unshielded. Rudimentary batteries only, enough to handle transports and light escorts, but useless against ships of the line. It has a special "ramming-mode" where it overburns its drives to plunge into an enemy ship to disgorge its complement of mutant boarders. The Sector navy has destroyed about a dozen of these vessels now, but their presence has only grown.

Berzerker: Heavy Raider (RH), about the size and power of an Imperial destroyer. It looks a lot like an Iconoclast, but with a prominent hatchet-shaped prow. High speed, but not nearly as fast as the Black Dart. Better shielded and carrying more batteries, it can be dangerous in numbers. It does, however, lack torpedoes and lances, making it less of a threat against capital ships. Like the Dart, it's been designed for boarding. In addition to ramming, the Berzerker has powerful retros than can be fired to tear free of the impact area, ripping out the innards of the enemy vessel.

Razorcrest: Frigate-sized ship recently spotted. It's visually similar to a Sword-class frigate, but instead of the heavy prow, it has a "crest" of adamantium running along the hull. It is possible that this crest can be used for "slashing" attacks against enemy ships.

Barotta caught glimpses of other ships being built around Samech, including larger hulls (up to battlecruiser size).