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Llealynarisia please add me to all the pinglists!!
I have a lot of ideas about the Fire fleet. Hope this doesn't conflict with anything already posted? Anyway.
Fire ships are massive, built in deep-space Forge stations so large that an entire hull can be cast and annealed within them. By tradition, the ships are christened not with champagne, but with a crucible of lava poured directly over the prow. The pattern into which it solidifies will mark the ship forevermore, like a fingerprint.
When in stealth mode, they appear as dark as any quiescent mountain. But inside the thick skin of the ship lies a raging furnace driven by a fusion reactor at its core. When captain wishes to reveal the ship, its outer hull layer splits with glowing cracks, til it flickers like coals in the dark. The pattern of cracks can be used display its class & registry, or even coded messages.
Fire ships carry an array of weaponry. Infrared lasers are most commonly used in long-range combat, but plasma is also a favorite. Yet the most legendary ability of a (large, say, Caldera or Inferno class) fire ship is the so-called "kiln maw." When an enemy is vanquished, Fire commanders seldom bother with dragging the ship home to be deconstructed or bartered back to its home fleet. Instead, a hatch is opened in the belly of the Fire ship, and the defeated ship is drawn inside. Any crew who have not already surrendered or revealed themselves will be literally smoked out. Then the ship itself will be taken apart by the very best Fire forge-engineers, and any parts that aren't of specific interest will be burned for fuel or melted down. It is said that some of the old battle-scarred vessels of the Fire fleet have collected enough raw material this way to built two or three clones of themselves-- no insignificant statement, given their bulk.
(The legend that "Fire doesn't take prisoners" is false, as their commanders have no interest in needless death-- but it would not be wrong to say that this fleet of builders has a streak of vindictive, jealous pride when it comes to the ships themselves.)
There are also an array of non-combat ships. The most impressive among these are not so much ships as space stations: huge deep-space habitats, often in the shape of a bicone or a square bipyramid. They can be as large as cities, with multiple heart-like engines that pump heat and air toward their extremities. Most orbit hot stars, or even lie at a safe orbital distance from tempestuous accretion disks, soaking up their radiation as fuel. Some have no parent star, and mine raw materials for their nuclear reactors from nearby rocky bodies. Most are highly industry-focused, with forges and workshops nestled inside them near the central reactors. They may also serve as ports for traveling starships.
Fleet classifications:
Flare class - diplomatic vessels; quick, bright, and welcoming
Cinder class - mining and material transport vessels
Bellows class - repair vessels, for servicing other ships mid-voyage
Forge class (station) - where the rest of the ships are built
Hearth class - small outpost space stations, mostly for temporary housing
Ember class - personnel transports, shuttlecraft
Magma class (station) - effectively small cities
Tephra class - small, fast, and agile, primarily used as scout ships or for precision combat
Candle class - medical vessels, no weaponry
Vulcanian class - science vessels, equipped with the very best sensors
Inferno class - giant engines of war and transport; huge but unwieldy
Caldera class - the fleet flagships, balanced vessels used for combat in wartime and for exploration in peacetime.