The gnome dreadnaught, shattered by Carl's aerial strike and reduced to a single balloon-borne house carrying Commandant Kane and his daughter.
Carl's hijacked-balloon strike guts the Wasteland. He unloads guided missiles into its bomb-laden underbelly and gun-battery just as it fires a hundred Live Ammo Balls at him; the dreadnaught's armor and much of its bulk blow apart in a white fireball, raining flaming debris across the bowl and even onto Hump Town and the land quadrant. The bombardment is averted (completing the quest "Squeeze out the Juice Box"), but the castle isn't taken — only stripped of its armor.
What survives is a single undefended building no bigger than a house, hanging from one balloon that drifts up to the bubble's ceiling. Through the farseer, Carl spots its lone occupants: Commandant Kane and a young gnome girl, roughly ten years old — his daughter. Carl resolves to board this remnant and take it "the old-fashioned way" to claim Kane's piece of the Gate of the Feral Gods.
Reduced from a vast dreadnaught to a single house-sized building dangling from one balloon, trailing smoke, drifting to the bubble's ceiling.
The wrecked air-quadrant castle, now a lone flying house sheltering Kane and his daughter — Carl's next boarding target.