Tales of Mar de Oro
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Nations of Aeon

A Power of Aeon

The Duchy of Heller

Twenty years old, two Dukes, three dragons, and no appetite for being governed from abroad.

The Duchy of Heller is the autonomous Valdegracian colonial territory, governed by Dux Hernanus Costesius de Heller and Dux Franciscus Perezzi. Its flag carries two gold dragons and the silver dragon of the presumed-dead Generalis Costilas. The Duchy owes Valdegracia military allegiance in time of war. In all other matters, it governs itself.

The twist. Its recent autonomy is real, but a declared war could restore the Crown's wartime authority over it.

Fortera in practice. Heller builds airship, industrial, and Dragon Line capacity while managing Éterlumin lift and signaling under the pressure of Valdegracian oversight.

Present Politics

The Duchy of Heller in 7202

Wants
Preserve real autonomy, continue modernizing, and avoid circumstances that activate the Crown's wartime authority over the Duchy.
Fault line
Most Hellerites want autonomy without an unnecessary break with Valdegracia. If a restorationist government attempts to reverse the settlement, outright independence stops being a fringe possibility and becomes serious policy.
Current move
Build enough naval, airship, industrial, diplomatic, and communications capacity to make interference expensive while preventing incidents with Albion from becoming an officially declared war.
Fears
Being trapped between Albion's provocations and Valdegracian restorationists, with either side creating the war that legally pulls Heller back under metropolitan military authority.
If unchecked
Heller becomes functionally independent while remaining constitutionally inside the Valdegracian sphere. If the Crown tries to reverse that reality, the Duchy may choose independence over submission.

The Character of the Duchy

The Duchy of Heller is not old. Its formal autonomy within Valdegracian dominion was acknowledged less than a year ago. Its founding as a settled community is barely twenty years past. By every conventional measure of statecraft, it should not yet be a thing with a character. And yet it has one, formed not over centuries of institutional accumulation but under the specific pressures of the New World: the pressure of distance from metropolitan authority, the pressure of necessity, the pressure of three men whose decisions in the early years of the colony shaped everything that came after. The Duchy is Solarian in faith. Its founders carried the faith across the sea with them, and it remains the official and genuinely practiced confession of the community. But the Duchy is also young and practical enough to understand that a colony in the New World cannot afford the luxury of confessional purity. Fellowship sailors, Oraclean merchants, the faithfully uncommitted: all are present in Hellerite harbors, and none are turned away. The Duchy does not advertise this. It simply does not expend the administrative energy required to prevent it. What the Duchy does advertise, through the conduct of its institutions and the reputation of its people, is that it is a community built on demonstrated loyalty, practical capability, and the specific kind of solidarity that forms among people who crossed an ocean without guarantees and made something work anyway.

The Three Founders

Three men stand at the origin of the Duchy, and their presence continues to shape it.

Generalis Melenko Costilas

Generalis Melenko Costilas was the military mind of the founding Compañero expeditions. He planned the early settlements, organized their defense, negotiated with other powers from a position of strength he created from materials that should not have been sufficient, and built the military culture that the Duchy still runs on. The Holy See's Offices of Inquiry denounced him on the mainland, citing conduct in the early colonial period that the Inquisition regards as heretical in method if not in confession. The Valdegracian crown proclaimed him a traitor, a charge that dates to a moment when Costilas chose the colony over a direct order to dissolve it and return the settlers to metropolitan authority. He is presumed dead. No confirmed account of his end exists, and the Duchy does not press the question. Had he lived, he would have been the third Duke, the silver dragon alongside the two gold ones. Instead he is honored on the flag in that form: the silver dragon, distinct from the gold, the space where the third founder would have stood. The Duchy does not eulogize him at length. It keeps his place on the flag. That is considered sufficient.

The two Dukes

The governing authority rests with two Dukes. Dux Hernanus Costesius de Heller, whose gold dragon appears on the Duchy's flag, is one of the founding three and governs the Duchy's civil and commercial affairs. Dux Franciscus Perezzi, whose gold dragon also appears on the flag alongside Costesius's, holds joint ducal authority. The dual-Duke structure was not inherited from any continental model. It was a practical arrangement made by the founders at the moment of formal self-organization: two governing voices, each with real authority, neither able to act unilaterally on matters of consequence. It has produced, so far, the kind of productive tension that prevents either Duke from becoming an autocrat and requires them to negotiate everything that matters. The three founders together, Costilas the denounced, Costesius the governor, Perezzi the partner, represent what the Duchy actually is: a thing built by specific people with specific histories, making specific decisions, in a specific place, for reasons that the official Valdegracian account of colonial governance was not designed to accommodate.

A History of Beginning

The Compañero expeditions that produced the Duchy's founders were not unauthorized ventures. They carried Crown sanction, a blessing from the Solarian hierarchy, and formal patents under Valdegracian colonial law. They arrived before Valdegracia had organized a colonial administration to follow or govern them, not before the Crown authorized them. What metropolitan authorities did not expect was that the expedition survivors would stay, build, and refuse to come home. That is what happened. The founders built harbors, roads, and defensive arrangements not because they were told to but because the alternative was a colony that did not survive. By the time Valdegracian administrative machinery arrived to organize what should have been Crown territory, it found a community that already had its own organization, its own internal hierarchy, and its own clear sense of what it was and what it owed to whom. The negotiation that followed was long, contested, and, on Valdegracia's side, conducted under a frustration that the diplomatic record sanitizes but does not conceal. The Duchy's autonomy, formally acknowledged within Valdegracian dominion only within the last year, is the outcome of that negotiation: real self-governance in exchange for a formal acknowledgement of Valdegracian suzerainty and a commitment to military allegiance in time of war. Valdegracia accepted these terms. It has not stopped resenting having accepted them.

The Duchy of Heller and the Idea of Beginning Again

In the Golden Sea, the Duchy's existence reads as a particular kind of message. It proves that a community can organize itself, maintain itself against institutional pressure, and eventually force that institution to acknowledge what already exists. For settlers, sailors, and people of every background who have found the older colonial arrangements inhospitable, the Duchy is evidence that the alternative is possible. This is not, in itself, the Duchy's intention. The Dukes govern a colony, not a symbol. But the symbol has formed around them regardless, and they are not unaware of its usefulness. The Duchy's colonial presence in Mar de Oro is modest in territory and significant in reputation. Its governors implement what they announce. Its military, shaped by Costilas's institutional culture, is smaller than most powers' equivalents and considerably more effective per person than most. Its harbors are open to anyone prepared to deal honestly. The flag, with its three dragons, two gold and one silver, is recognized across the archipelago as a mark of competence administered without the performance of grandeur that other powers cannot seem to avoid.

What a Hellerite Carries

The character formed in Hellerite culture carries the solidarity of people who crossed an ocean together without guarantees. Not sentiment about it, not nostalgia, but the functional version: a strong instinct for who is reliable, a quick and accurate read of whether a person delivers what they say they will, and a corresponding impatience with the elaborate social performances that other cultures use to establish trustworthiness without actually demonstrating it. They carry a relationship to authority that was built by the founders' example. Authority in the Duchy is earned through demonstrated competence and maintained through continued performance. It is not inherited, not granted by metropolitan appointment, and not secured by confessional alignment. A Hellerite character who meets someone of high rank will, instinctively and without rudeness, be asking the same question they ask of everyone: can you actually do the thing? They carry the Solarian faith as a genuine, practiced commitment, and they carry alongside it the practical tolerance of a community that has needed every willing person and could not afford to turn away good ones on confessional grounds. These two things coexist without particular tension in Hellerite culture. The faith is real. The pragmatism is also real. Neither cancels the other.

Three Dragons, No Rank

The Duchy's flag carries three dragons, the silver dragon of Generalis Emeritus Costilas and the two gold dragons of Dux Costesius and Dux Perezzi. In Hellerite ports, the flag is flown without rank distinction between the three charges, all three visible, all three equal in placement. The silver is not subordinate to the gold, and the gold does not outrank the silver. This is not accidental. The founders designed the flag together, and the arrangement was the point.

GM use

At the table

What outsiders get wrong
Heller is fully sovereign.
It governs itself within Valdegracian dominion; its autonomy was acknowledged less than a year ago.
The Compañeros sailed without sanction.
The founding expeditions had Crown patents before colonial administration followed.
Every Hellerite wants independence.
Many want autonomy without an unnecessary break from Valdegracia.

If this power moves next...

Roll a d6 or choose a play prompt. These are possibilities, not scheduled events.

  1. 1.Improve a Dragon Line station's reliability.
  2. 2.Commission a new lift-system inspection.
  3. 3.Strengthen a harbor before Albion tests it.
  4. 4.Ask Valdegracia to respect the autonomy settlement.
  5. 5.Expand industrial capacity without declaring a break.
  6. 6.Contain an incident before it becomes a declared war.

Forces, Services & Equipment

Forces and Service

Heller Ducal Guard

In service of the Sun and the Dragon

The Duke's household troops guard the palace, accompany the ducal standard, and serve wherever Heller's authority must be visibly maintained. On campaign, they protect the command and fight as an elite infantry regiment when the line must be steadied or a vital position secured.

Service and deployment

The Guard is not held back by fixed rule. When the Duke takes the field, its companies remain near the command, ready to reinforce a threatened position, lead a deliberate counterattack, or preserve an organised withdrawal. When serving without him, they fight alongside Heller's regular infantry.

Their discipline and compact formations make them particularly effective in streets, fortifications, aboard ships, and wherever broken ground prevents a larger line from operating freely. They are expected to remain formed when other units have become scattered and to rally those still willing to stand.

The Guard's hardened cuirasses are proofed before issue. At distance, or when struck at an angle, the plate may turn or arrest a musket ball that would kill an unarmoured soldier. At close range, a square hit may still penetrate or disable the wearer. The Guard treats its armour as an advantage, never as a certainty.

Heller Cuirassiers

The Dragon rides beneath the Sun.

Heller's cuirassiers combine the striking power of heavy cavalry with the flexibility of dragoons. They counter enemy horse, exploit openings in the line, and dismount when vital ground must be seized or held before infantry can arrive.

Mounted and dismounted doctrine

The cuirassiers usually remain behind the main formation or guard its exposed flanks. When enemy cavalry commits, they countercharge in ordered squadrons, relying on cohesion, powerful horses, and hardened armour to defeat lighter mounted troops and prevent attacks upon Heller's infantry or guns.

Against infantry, they avoid steady formations prepared to receive cavalry. They wait for musketry, artillery fire, broken ground, or confusion to expose a flank or open a gap. Once committed, they enter that weakness, widen it, seize guns, and prevent shaken troops from reforming.

Every squadron also carries shortened firearms and is trained to fight dismounted. The cuirassiers may secure a bridge, occupy a village, defend an artillery position, or hold difficult ground until regular infantry arrives. Their horses are withdrawn under guard while the remaining troopers form a compact firing line.

Their hardened cuirasses may turn distant or oblique musket fire, but their horses remain unarmoured and vulnerable. The cuirassiers therefore depend upon timing, manoeuvre, and mutual support rather than armour alone.

They are neither scouts nor simple pursuers. They are Heller's mobile reserve, sent wherever mounted force, disciplined fire, or an immediate counterattack can decide the field.

Heller Line Infantry

Disciplined in line, dangerous apart.

Trained by veteran Valdegracian Compañeros, Heller's line regiments combine imperial drill with unusual freedom of action. They can fight in formed lines, divide into smaller detachments, and reform under pressure without surrendering cohesion.

Compañero doctrine

Hellerite battalions are not bound to a single formation. In open ground they deploy in line and deliver controlled volleys. When terrain, visibility, or circumstance demands it, companies may advance in column, occupy separate positions, refuse a flank, or send trained files forward as skirmishers.

Officers and senior sergeants are taught the purpose of an order, not merely its wording. They are expected to read the ground, act when communication fails, and coordinate with neighbouring companies without waiting for every decision to pass through headquarters.

Detached units remain within supporting distance whenever possible. One company may fix the enemy while another moves through cover, reinforces a threatened position, or prepares a short counterattack. Once the immediate task is complete, the battalion reforms before advancing further.

This flexibility does not make them light infantry. They remain disciplined line soldiers, capable of changing shape without losing their command structure or battlefield purpose. Their strength lies in carrying Valdegracian training into conditions where a more rigid formation would fail.

Heller Marines

No deck beyond reach.

Heller's naval marines serve aboard both seagoing and flying vessels. They are trained for boarding, shipboard defence, and prize taking: crossing under fire, establishing a foothold, and seizing vital compartments without destroying the vessel they intend to capture.

Boarding doctrine

At sea, boarding parties cross by boat, grapnel, or boarding bridge. In the air, they use secured lines, harnesses, and bridges between vessels in flight. The conditions differ, but the objective remains the same: gain a foothold before the defenders can concentrate.

The first section clears the point of entry. Those following secure decks, hatches, ladders, and passages, opening a route for engineers and the prize crew. Muskets are used across open decks and long passageways. Pistols and cutlasses take over where space becomes confined.

Marines are trained to identify magazines, steering gear, lift controls, Éterlumin systems, and other machinery that must be captured intact. Fire around these areas is tightly controlled. Engineers and prize crews follow as soon as a secure route has been established, preventing sabotage and taking control of the vessel.

In defence, Hellerite marines cut hostile boarding lines, seal access routes, protect vital compartments, and counterattack before the enemy can consolidate its foothold.

Heller Engineers

Built true. Kept ready.

Heller's engineers serve wherever machinery, fortifications, or technical systems must remain operational. Most are assigned to the Duchy's flying vessels, maintaining lift systems, Éterlumin controls, steering gear, pumps, and the machinery that keeps an airship balanced in flight. Others accompany field forces, ships, dockyards, and shore installations.

Engineering service

Aboard airships, engineers monitor pressure, temperature, lift, and Éterlumin stability. Changes in altitude, cargo, weather, or battle damage can disturb the vessel's balance, requiring constant adjustment before a minor fault becomes a loss of control.

During battle, engineering teams isolate damaged systems, suppress fires, brace weakened structures, and bypass failed machinery. They decide what can be repaired immediately, what must be shut down, and what may be sacrificed to preserve the vessel.

Engineers may also be sent into the field to repair bridges, batteries, Dragon Line stations, roads, fortifications, and damaged equipment. They prepare defensive works, restore essential machinery, and keep an advancing force connected to its supplies and communications.

During prize taking, engineers follow the marines once a secure route has been established. They seize control of the machinery, prevent sabotage, and determine whether the captured vessel can still sail or fly under its own power.

Sky-Lung Apparatus

Developed for Heller's air fleet, the Sky-Lung supplies breathable air at extreme altitude and in smoke-filled or poorly ventilated compartments. It allows deck crews, engineers, marines, and rescue parties to remain effective where unprotected personnel would quickly become impaired.

Operational use

The apparatus combines a sealed mask, pressure regulator, gauge, and compressed-air bottle. The bottle permits independent movement for a limited period, while a quick-connect line allows extended use when attached to a vessel's central air supply.

Sky-Lungs are issued for high-altitude deck work, emergency repairs, firefighting, rescue operations, and boarding actions above the safe breathing limit. Engineers also use them when damage or fire makes enclosed machinery spaces unsafe to enter without assistance.

The apparatus does not protect against extreme cold, fire, or structural failure. Its purpose is to keep trained personnel conscious and working when the surrounding air can no longer sustain them.

The Sky-Lung gives Heller a practical advantage at altitude. Its vessels can remain operational higher and longer, while crews can enter conditions that force less-prepared rivals to descend or withdraw.

Heller 6-Pounder Field Gun

Breech-loading field artillery

The Model 7198 P.S.E. is one of the few breech-loading guns in Heller's land service. Adapted from naval ordnance practice, it uses brass-cased ammunition and a sealed breech to provide faster loading and more reliable firing than a conventional muzzle-loaded field piece.

Service and operation

Explosive shell is not unique to the Model 7198. Muzzle-loading artillery has used shell and case ammunition for generations. What remains unusual is the use of complete brass-cased rounds in a mobile field gun, combining projectile, charge, and primer for rapid loading through the breech.

The Model 7198 is issued only to selected field batteries and naval landing forces. Its compact carriage allows it to move with infantry, while its graduated elevation mechanism and rapid loading make it valuable when a battery must engage several targets or relocate before the enemy can respond.

The weapon requires precise manufacture, specialised ammunition, and crews trained to inspect and maintain its breech. Most Heller artillery therefore remains muzzle-loaded. The Model 7198 is reserved for formations whose mission justifies its cost and demanding supply requirements.

Heller Naval Officers and Ratings

Duchy of Heller Navy

Heller's naval officers and ratings crew the Duchy's seagoing warships, patrol vessels, transports, and prize ships. The service is small enough that experience is valued over rigid separation of duties, but disciplined enough that every sailor knows both a primary station and an emergency role.

Service aboard ship

Ratings serve in deck, sail, gunnery, navigation, signals, stores, and damage-control parties. Each is trained for a second station so that casualties or storm damage do not leave an essential duty unmanned. Deckhands reinforce gun crews, gunners assist at the pumps, and experienced hands carry orders when noise or smoke disrupts communication.

Officers are expected to understand seamanship, gunnery, navigation, damage control, and prize procedure. Heller's captains often operate far from immediate support, where a damaged vessel must be repaired by its own company and a captured ship must be crewed from those already aboard.

The Navy's duties range from convoy escort and coastal patrol to landing operations, blockade running, and prize taking. Its crews are trained to preserve ships whenever possible. A captured hull, rescued cargo, or repaired vessel may matter more to Heller than the destruction of an enemy at sea.

Heller cannot replace trained sailors quickly. Its ship companies are therefore expected to absorb losses, redistribute duties, and bring the vessel home under sail, jury rig, or tow.

Heller Naval Air Service

Officer and aircrew

The Naval Air Service crews the Duchy's flying warships, including its heaviest frigates and command vessels. Its officers and ratings are selected from Heller's most capable sailors, engineers, gunners, and marines, then trained to operate the most powerful and technically demanding weapons in the ducal service.

Service and standards

Selection is exacting, and training continues long after assignment. Every crew member masters a primary station and at least one emergency duty. Officers study aerial navigation, gunnery, lift control, damage response, and boarding defence. Ratings specialise in guns, signals, rigging, lift machinery, engineering support, and exposed-deck operations.

Crews drill for fire, sudden loss of lift, steering failure, damaged communications, and casualties at essential stations. They are expected to redistribute duties without losing discipline or interrupting the operation of the vessel.

A flying warship depends upon precise coordination. Gunnery, manoeuvre, lift, and engineering cannot act independently without endangering the ship. Orders are repeated clearly, failures reported immediately, and fire is controlled even under close attack.

Service in the air fleet carries exceptional prestige, but its standards are severe. Heller can build another hull more easily than it can replace a veteran aircrew capable of fighting one to its full potential.