Amalgamation of tubes and trumpets, some golden or bronze, coppered perhaps, these trumpets spit burning fires from the sides or top with its main trumpets-tubes, two huge Wheels on the side to drag it around and sometimes 3 small wooden Wheels, It bleeds and it is believed to be inserted with souls of the unborn, upon being destroyed you may notice the contraption itself would never work if built by a man, almost as if it was working purely out of demonic force, example is how the wheels are directly connected as if it was just smushed there, and no actual sense on how it would turn to the sides in the "normal" way, something you could compare was the sabotaged tank blueprints made by Da Vinci, Nevertheless it works by unknown means as far as we know

Pouring Boiling oil onto the Machine seems to cause very little harm to it, but worsens its flames, almost making a greek fire substance (Napalm if you are boring), when said Machine gets stabbed in between its tubes and trumpets it appears to bleed and sometimes organs come out, yet when broken and fully unoperational no body or organs can be found, just blood and a composite that appears to be black tar oil of actual unknown substances

These Machines were First seen in the first Demonic siege of Calial in 728 AD, Their effectiveness is still to be known, Other than it being only a Terror weapon used by Demons and Other Unholy Underworldly Creatures