Pirates of Skyview
Aerstone is a light fragile crystal which collects in the highest areas of the Uplands.
Aerstone is either the source of Aether, or the crystalized collected form of it, none are sure which. All that is known by most is that when it shatters it ‘bursts’ into small pockets of Aether. Most often it’s needed on the commissioning of a new dirigible, where large quantities are used to initially inflate the interior ballonets, and smaller quanities are kept on board to handle refilling in cases of emergencies.