The key materials of the Rebel Skies world are the minerals that govern floating physics and the substances derived from their interaction.
A hard, crystal-like substance naturally present within floating islands. It shows up on exposed surfaces of islands (typically underneath) as blue colored "veins." It is the primary substance responsible for keeping islands aloft — it counteracts gravity in a way that is not yet fully understood by present-day science.
The Floating Mineral can be extracted and manipulated in controlled amounts. Its most deliberate application is in Codex/World/Cloud Skims, where a precisely balanced enclosure causes the craft to "float" at a given altitude without drifting significantly on its own.
Making this work in a skim is difficult and rare. The enclosure tolerances are tight, and the balance between Floating and Heavy Mineral within it is delicate. This is one reason Cloud Skims are uncommon and their construction requires skilled Setting/World/Professions/Windcarvers.
The precise mechanics of the Floating Mineral need to be fully developed. Why is it difficult to use in Cloud Skims specifically? What limits how much can be extracted from an island?
A dense, coal-like substance that acts as the gravitational counterweight to the Floating Mineral. Before Codex/World/The Shattering, it was massively mined — its removal at scale is what caused the event.
The same principle still applies at the island level. Removing Heavy Mineral from a floating island alters its altitude, but unpredictably. Altitude changes have cascading effects: the island's climate shifts, its weather changes, and which other islands it will encounter in orbit may change entirely. Island communities understand this and do not mine the Heavy Mineral carelessly.
More detail on current attitudes toward the Heavy Mineral — is there any controlled use of it? What happens to Heavy Mineral that is removed? Has anyone attempted to deliberately raise or lower an island? See AI Content Review.
Lift Dew (called "Flux Essence" by Windcarvers, "Sparkle Honey" by children) is a naturally occurring substance that forms at Floating Mineral vein exposures on the undersides of islands. It accumulates overnight, reaching peak concentration before dawn, and evaporates completely within about 8 hours if not stabilized — or 24 hours at most when preserved.
It appears as luminescent, slightly viscous droplets with a pale blue shimmer. When exposed to water within a contained system, it undergoes a rapid energy release — the reaction that powers Cloud Skim Dew Furnaces.
Lift Dew is gathered in pre-dawn hours using fine brush collectors designed to absorb the substance without contaminating it through heat or touch. On Trimont, the auxiliary island's overlap with the main landmass provides accessible collection points — including ones children can reach safely when making Leaf Ships.
Several methods slow evaporation:
Dandelion Pappus — the microscopic structure of dandelion seed parachutes creates a matrix that stabilizes the dew through temporary molecular bonds. This is the most accessible method; children use it for Leaf Ships, and it is the practical baseline for most day-to-day collection.
Crystal Suspension — finely ground mineral powder (similar in composition to Floating Mineral) maintains stability more reliably, used in professional applications.
Cold Storage — temperature reduction slows evaporation significantly but is energy-intensive and only practical for critical uses.
Even with these techniques, Lift Dew cannot be stockpiled indefinitely. Pilots must harvest fresh dew before sorties.
Beyond Cloud Skim propulsion, Lift Dew has various uses in Trimont's society:
Children on Trimont make Leaf Ships — miniature flying vessels that use Lift Dew stabilized with dandelion pappus and placed in a small depression formed from a boat-shaped leaf. When water is applied to the leaf furnace, the ship launches. Many future Windcarvers trace their interest back to these early experiments. Some established Windcarvers still keep their best childhood designs.