Brumestone

Brumestone is a mineral that, when properly enchanted, levitates in the air.

Description
Brumestone is a bluish stone or mineral that a very basic, simple enchantment can cause to lift. It is then capable of levitation, and can carry structures to which it is mounted to rise into the air. A Skyship is typically mounted with three large brumestones, which allow it to carry up to ten tons of cargo while still maintaining flight.

Usage
During the Age of Arcanum, the knowledge of how to enchant brumestone was widespread, allowing it to be created in massive quantities. This abundance was used to create the great flying cities of the era: Aeor, Zemniaz, and Kethesk. Only a handful of cities were so elevated. Those three had utilized and cornered the market on brumestone and therefore could afford to hold their entire cities aloft. Aeor also had a form of elevator called "brume lifts", suggesting that they were likely powered using brumestones.

Now in the Post Divergence era, that knowledge has been largely lost. Until recently, only the Alsfarin Union, based in the city of Ank'Harel knew the process, using the brumestones to create skyships. They kept the enchantments a closely guarded secret. While the Alsfarin Union sold skyships to foreign businesses, they kept absolute control over the skyships' maintenance. However, during the War of Ash and Light in Wildemount, the city of Hupperdook created small mobile skyships for use by the Dwendalian Empire.

The city of Draconia, a fallen shard of the Arcanum-Age flying city Kethesk, had its brumestones mined to raise the city as an archipelago of flying islands. When the city was destroyed by Vorugal during the Chroma Crisis, the brumestones were again repurposed by the Ravenites building their new city of Xarzith Kitril. There, brumestones are used to hold gondolas aloft that carry goods and people across the city.