Plague Hulk
Plague Hulks is what happens when a Soul Grinder found Papa Nurgle's love. As you can imagine, Plague Hulks are a pain in the ass to kill in a already pain in the ass to kill Daemon Engine. The chassis of the machine supports a maggot-ridden mass of daemonic flesh, at the center of which sits a maw capable of vomiting a tide of filth that can rot flesh and corrode metal. Plague Hulks are essentially a even bigger and fatter bastard than the Great Unclean One.
Weaponry
The biggest offense for the Plague Hulk is its natural decaying and bloated body filled to the brim with extremely hungry maggots and corrosive stomach acids. Other than its really dangerous physical hygiene, Plague Hulks also carry the iconic Mawcannon which to literate again; are a gaping maw at the center that is capable of vomiting a tide of filth capable reducing infantry into puddles of goo and vehicles into melted metal.
The Plague Hulk armament also includes an arm-fused cannon of arcane origin known as a Rot Cannon. The Rot Cannon belches out shells that are so impregnated with dark ichor and infection that a mere scratch from one of the weapon's bone fragments will immediately and agonisingly fester into a crippling injury (Think gangrene on steroids).
The Plague Hulk, much like its unaligned cousins the Defiler and Soul Grinder is armed with two massive mechanical Dreadnought Close Combat Weapons known as Iron Claws, which are also sometimes called Servo Claws. These weapons usually take the form of large, piston-driven claws featuring three bladed talons and are fully capable of ripping main battle tanks into scrap metal and swiping and crushing entire squads of infantry in a single sweep.
The daemon-machine also carries a weapon in its single, massively powerful limb. This weapon usually takes the form of a gigantic cleaver or huge rusted flail which can crush and slice heavy armor and rot the soft flesh of their fouls in seconds.