Crassus Armored Assault Transport
Named for Borgen Crassus, one of the leading generals of Lord Solar Macharius, the CRASSUS ARMOURED ASSAULT TRANSPORT, aka the Mark IX Tank IN SPAAAAACE!, is one of the heaviest armored transports available to the Imperial Guard. Armed with a quartet of heavy bolters and capable of lugging 35 of your t-shirt wearing maniacs around the battle field, the CRASSUS ARMOURED ASSAULT TRANSPORT is essentially the Guard Landraider.
Based on the chassis of the Macharius Heavy tank, the CRASSUS ARMOURED ASSAULT TRANSPORT is the perfect vehicle for carrying large amounts of Guardsmen directly into enemy fire and dropping them off exactly where you need them.
Even though the Crassus is a relatively new addition to the arsenal of the Imperial Guard, it has already become famous for its heavy armor and firepower, and has entered widespread use in the southern and western regions of the Segmentum Tempestus and after only a few centuries the Crassus design is now being constructed on the Forge World of Lucius and is used to extensively resupply the Imperial forces that are guarding the space around the Eye of Terror to replace the on-going losses in that steadily worsening warzone.
There, as everywhere else it had been deployed, the Crassus had earned a considerable reputation for its sheer power and durability. This reputation has given the vehicle near-talismanic status amongst some siege assault units of the Imperial Guard, to the concern of some within the Commissariat and the Departmento Munitorum.
In case you were wondering, some fellow asked about whether it'd be worthwhile getting the CRASSUS ARMOURED ASSAULT TRANSPORT, which they wrote in all caps because they just copied that from Forge World's product list wherein everything is listed in all caps. Memes of course, ensued.
Praetor Armoured Assault Launcher
Much as the Chimera was modified into the Manticore Rocket Launcher by ripping out the troop compartment and bolting a missile launcher to the top, the PRAETOR ARMOURED ASSAULT LAUNCHER mounts a massive Praetor missile launcher instead of a transport bay. It can launch Foehammer missiles for cracking armor, Firestorm missiles for blasting large infantry formations, or Pilum (Latin, "Javelin") missiles for anti-air defense.
However, due to the vehicle's complexity, it has not been as widely distributed as the more basic CRASSUS ARMOURED ASSAULT TRANSPORT. While the Praetor's sophisticated systems and relatively high materiel cost makes it unlikely to replace or supplant the existing Imperial designs for mobile rocket artillery pieces, its durability and sheer versatility have already ensured it a valued place amongst those Imperial Guard units facing the most deadly adversaries of the Imperium.
An interesting trivia is that the design for the Praetor Heavy Assault Launcher actually predates the introduction of the 'CRASSUS ARMOURED ASSAULT TRANSPORT and it is believed that the last time the Praetor saw widespread use by the armed forces of Imperium was against the Land-Leviathans deployed by the Tellarite Rebellion forces who had forged their a pocket-empire in their little corner of the galaxy during the dark years of the Nova Terra Interregnum.
Dominus Armoured Siege Bombard
Another variant of the CRASSUS ARMOURED ASSAULT TRANSPORT the DOMINUS ARMOURED SIEGE BOMBARD replaces the troop transport capability with a massive Dominus Triple Bombard. This turns it into a dedicated artillery piece that can rapid fire due to its automated weapon system and the fact that it carries not one, not two but THREE enormous mortars, meaning that it can devastate entire blobs of armies in a single phase. It's the Wyvern's bigger, angrier brother with a prison record.
In practice the Dominus throws 10d6 S10 ap-3 shots with indirect fire when stationary, easily wiping any unit foolish enough to be larger than 5 models. S10 Ap3 is also a serious threat to any armour short of a titan, and the weight of shots pretty much guarantees an overkill of single model targets. Think of it as an entire battery of Basilisks in one vehicle, except for less points, with better armor, no Open-Topped bullshit, and a pair of sponsons to defend itself.
One final point of delight in this things favor comes from how overwatch works - not only does it get to fire everything it has at anything that charges it (which will frequently paste dreadnoughts even hitting on 6s) but can simply drive out of combat and keep shooting thanks to its Steel Behemoth ability.
Despite having had rules released for it in the 8th edition overhaul, the Dominus doesn't actually have an official model. So expect a lot of fan conversions like the image on the right.