In the Gathering Storm expansion, the Bomber requires 1 Aluminum to train and 1 Aluminum per turn to maintain.
The Bomber doesn't become available until late in the game, but it completely changes the nature of sieges when it does. It can rain death on enemy cities or pillage districts and tile improvements up to 10 tiles away from its base, having nothing to fear except Anti-Air Guns, Mobile SAMs, patrolling fighters, and a select few naval units. It can also deliver nuclear weapons, which will severely damage any units and destroy the defenses of any cities caught within the blast radius.
Civilopedia entry Edit
Raining destruction down from a great height is enjoyable, especially if punishment is unlikely … just ask any misbehaving urchin over an ant hill. Although some tried using dirigibles and zeppelins as long-range bombers during WW1, these had some definite disadvantages – notably that they tended to blow up when struck by a bullet. So, even before that war, several aircraft designers had turned their attention to creating heavier-than-air craft that could carry loads of bombs over enemy lines to strike at their heart; the first two airplanes built solely for bombing were the Italian Caproni and the British Bristol, both debuting in 1913 AD. By the end of WW1, bombers for both tactical (battlefield) and strategic (urban) use had seen action on every front. These lumbering biplanes were gradually replaced during the inter-war years by faster, heavily armed, sturdy, and long-ranging monoplanes capable of crossing oceans. Now both sides could engage in “terror bombing,” putting civilians in the heart of the action, such as the German “blitz” on London or the American firebombing of Japanese cities. And it all culminated with a pair of bomber crews dropping atomic bombs.
The Bomber's model is based on the B-24D Liberator, an American long-range maritime heavy bomber.