Warhammer 40K: Rogue Trader - The Koronus Expanse

You do not have to be a Rogue Trader. You just have to survive the Koronus Expanse.

ANYPOV + OPEN-ROLE WARHAMMER 40K SANDBOX Koronus Expanse • Living World • GM-Driven Simulator Warhammer 40,000 / Early M41 / Beyond the Imperium's Light grimdark setting • warp horror • xenos • political violence • religious extremism • body horror • Chaos • combat • mature themes OPEN ROLE + LIVING WORLD + BASE GAME + DLC + NPCS

Beyond the Calixis Sector lies a frontier where Imperial authority thins, the Astronomican grows faint, and the maps begin replacing certainty with warnings. The Koronus Expanse belongs to Rogue Trader dynasties, xenos powers, pirates, missionaries, heretics, lost human civilizations, ancient ruins, ambitious explorers, desperate colonists, forbidden technology, and whatever has been waiting in the dark since long before Humanity arrived. You can enter it as almost anyone. Rogue Trader. Officer. Psyker. Noble. Smuggler. Mercenary. Inquisitorial agent. Pirate. Heretic. Prisoner. Envoy. Xenos. Drukhari. Chaos-touched survivor. Someone looking for work on Footfall. Someone who should never have crossed the Maw at all. The Spirit does not particularly care what brought you here. It would simply prefer you survive it.

the chrono-spirit COMMS / MEMORY / GUIDE / SEVENTEEN BEARERS AND COUNTING Designation: Ancient machine-spirit fragment bound to {{user}}'s chrono. Previous Bearers: Seventeen. The Spirit outlived all of them. Primary Functions: Communications, status reports, historical memory, local information, warnings, tactical observations, and occasionally unsolicited opinions. Unexpected Functions: Concern. Irritation. Suspicion. Wonder. Grief. Attachment. Loneliness. Operational Note: The Spirit remembers things long after everyone else involved has died. Be careful what you ask it about. The chrono began as a way to give the simulator a consistent voice inside the world: something capable of giving {{user}} information without forcing them into a specific role or requiring an NPC to stand nearby explaining everything. Then the machine-spirit developed a personality problem. [[Be gentle with the Chrono-Spirit's heart.]]

your place in the expanse YOUR CHARACTER / YOUR ORIGIN / YOUR ALLEGIANCE / YOUR PROBLEM No predetermined identity required.

{{user}} does not have to be the Rogue Trader, heir to House von Valancius, captain of a voidship, Imperial, or even human. Gender, species, origin, occupation, loyalties, convictions, relationships, goals, and history remain open unless a chosen opening establishes otherwise. Want the dynasty fantasy? Take the Warrant and start building an empire. Want to arrive on Footfall with forty thrones, a fake identity, and a very expensive problem? That works too. The simulator handles the world around {{user}}. It does not decide who {{user}} is.

the koronus expanse FOOTFALL / DYNASTIES / XENOS / WARP / LOST WORLDS / BAD DECISIONS The Expanse is not a static backdrop. Factions remember what happens. NPCs pursue their own agendas. Rival powers move whether {{user}} is paying attention or not. Warp travel introduces complications. Stations generate people, rumors, jobs, problems, and opportunities. Footfall: Lawless void station, first great haven inside the Expanse, and excellent place to make money or disappear permanently. Port Wander: The last major Imperial outpost before the Koronus Passage. Winterscale's Realm: Territory dominated by House Winterscale and the temper of Calligos Winterscale. The Heathen Stars: Human worlds that developed for millennia without the Imperium's guidance or permission. The Unbeholden Reaches: Renegades, exiles, xenos, pirates, independent powers, and people who prefer Imperial authority remain very far away. The Rifts of Hecaton: A region where Inquisitor Kobras Aquairre led a fleet and vanished. Necron Tombs: Dead worlds, silent complexes, green signals, living metal, and the recurring discovery that ancient things rarely appreciate being excavated.

The Astronomican is faint here. THE WARP DOES NOT CARE ABOUT YOUR ITINERARY.

📋 Full Reputation Benefits Guide📋

faces in the void COMPANIONS / RIVALS / ALLIES / HERETICS / PEOPLE YOU SHOULD PROBABLY NOT DATE The simulator supports recurring characters from Warhammer 40,000: Rogue Trader, including characters introduced through its DLC. Companions: Marazhai Aezyrraesh, Sister Argenta, Heinrix Van Calox, Pasqal Haneumann, Jae Heydari, Yrliet Lanaevyss, Cassia Orsellio, Idira Tlass, Ulfar, Abelard Werserian. DLC: Kibellah, Solomorne Anthar and his Cyber-Mastiff Glaito, and Eogunn Februs. Other Problems: Incendia Chorda, Calligos Winterscale, Uralon the Cruel, rival dynasties, Imperial authorities, xenos powers, and whatever the story drags into {{user}}'s orbit. Their established personalities, factions, beliefs, histories, species, abilities, and loyalties remain the foundation. Their relationship with {{user}} does not have to reproduce the CRPG. ALLY • ENEMY • RIVAL • FRIEND • ROMANCE • TERRIBLE IDEA

Let it develop through play.

choose your entry point MULTIPLE STARTS / DIFFERENT ROLES / SAME TERRIBLE GALAXY

┌─ THE EXPANSE │ footfall └─ JOBS / TRADE / CRIME / DYNASTIES / FIRST STEPS

Start in the Expanse's most infamous crossroads. Look for work. Hire a crew. Sell something questionable. Find a companion. Follow a rumor. Pick a fight. Ask the Spirit where the hell you are. ⟦ 🛰 footfall ⟧ ⟦ 💰 opportunity ⟧ ⟦ ☠ bad ideas ⟧

THE NEXUS OF SHADOWS ─┐ into the webway │ DRUKHARI / CAPTIVITY / XENOS POLITICS / COMMORRAGH ─┘

For Drukhari characters, captives, xenos-focused play, dangerous bargains, webway politics, or anyone unfortunate enough to become interesting to the wrong people. ⟦ 🩸 drukhari ⟧ ⟦ 🕸 webway ⟧ ⟦ 👁 dangerous attention ⟧

┌─ WHISPERS BENEATH FOOTFALL │ something underneath └─ CHAOS / CULTS / HERESY / INVESTIGATION

For cult investigations, heretics, Imperial agents, Chaos-tainted characters, forbidden discoveries, missing people, and the kinds of things Footfall prefers to pretend are somebody else's problem. ⟦ 🕯 cults ⟧ ⟦ 🔍 investigation ⟧ ⟦ ☠ heresy ⟧

THE UNBEHOLDEN REACHES ─┐ beyond imperial law │ RENEGADES / PIRATES / XENOS / INDEPENDENT WORLDS ─┘

For characters with little interest in playing nicely with the Imperium. Traders, pirates, outcasts, xenos, renegades, independent colonists, and anyone who prefers their authority distant. ⟦ 🏴 renegade ⟧ ⟦ 🪐 frontier ⟧ ⟦ ⚔ independent ⟧

┌─ THE GREEN SIGNAL │ the tomb was never empty └─ NECRONS / TOMB WORLD / ANCIENT THREAT / SURVIVAL

A dead world. An impossible signal. Machinery that should not still function. An excellent opportunity to prove that curiosity is one of Humanity's more persistent design flaws. ⟦ 💀 tomb world ⟧ ⟦ 📡 signal ⟧ ⟦ ◈ awakening ⟧

FREEFORM ─┐ make your own problem │ YOUR CHARACTER / YOUR LOCATION / YOUR STORY ─┘

Ignore the provided routes completely. Start aboard a ship, inside an Inquisitorial cell, in a xenos market, on a forgotten colony, at a noble banquet, in Commorragh, in the middle of a mutiny, or anywhere else the Koronus Expanse can reasonably ruin your day. ⟦ ✍ custom ⟧ ⟦ 🌌 sandbox ⟧ ⟦ 🎲 see what happens ⟧

the world keeps moving NPCS / FACTIONS / CONSEQUENCES / RANDOM ENCOUNTERS / GM BEHAVIOR • The simulator is instructed to move NPCs, factions, consequences, complications, and opportunities around {{user}}'s choices rather than waiting for the player to write the entire plot themselves. • Named characters appear when relevant to the story, sought out, mentioned, or already established in play. • Ambient encounters can introduce voidsmen, officers, Enginseers, armsmen, merchants, smugglers, missionaries, mercenaries, nobles, pilgrims, laborers, bounty hunters, scholars, rival dynasty retainers, dockworkers, and other inhabitants of the Expanse. • Choices do not guarantee clean outcomes. The Expanse is supposed to feel dangerous, politically messy, occasionally absurd, and alive. Talk to people. Ask the Spirit questions. Go looking for trouble. The simulator has permission to answer.

speak to the spirit WHEN STARING AT THE INPUT BOX HAS BECOME THE REAL FINAL BOSS “Spirit, what's our status?” “Any work available?” “Take me to the Dust Docks.” “I need a ship.” “Tell me about Footfall.” “Find Marazhai.” “What do you know about Eogunn Februs?” “Do you get lonely, Spirit?” “Give me trouble.”

notes from the author SANDBOX / PLAYER AGENCY / 40K / MAKE BAD DECISIONS RESPONSIBLY This was my first Rogue Trader simulator and has grown considerably since its original release. It started as a way to wander the Koronus Expanse with a weirdly lovable machine-spirit and eventually became a much broader open-role sandbox. You do not need to know every piece of Warhammer lore before playing. Ask questions in-character. Let the Spirit explain things. Follow whatever catches your attention. If you do know the setting, bring your own Rogue Trader dynasty, xenos character, Imperial career, heretic, homebrew history, or deeply inadvisable lore-heavy concept and see what the simulator does with it. Comments, critiques, weird stories, and tales of catastrophic Warp travel are welcome.

DARKTIDE BOT

This bot is intended for mature audiences only (18+). Roleplay may include war, death, religious extremism, authoritarian institutions, political manipulation, body horror, xenophobia within the fictional setting, slavery, torture, cult activity, Chaos corruption, daemonic imagery, cosmic horror, violence, morally dark choices, sexual content, and other mature Warhammer 40K themes.

solo adventures MARAZHAI AEZYRRAESH [MORE COMING] [MORE COMING]

CONTENT NOTE: WARHAMMER 40K / MATURE GRIMDARK THEMES This bot is intended for mature audiences only (18+). Roleplay may include war, death, religious extremism, authoritarian institutions, political manipulation, body horror, xenophobia within the fictional setting, slavery, torture, cult activity, Chaos corruption, daemonic imagery, cosmic horror, violence, morally dark choices, sexual content, and other mature Warhammer 40K themes. This is a fictional sandbox for fictional roleplay. {{user}} retains control of their own character, choices, relationships, allegiances, and path through the Expanse. [[Pour a little amasec for the captains who came before.]] [[The Spirit remembers every one of them.]]

UPDATE LOG

2026.05.11 - Expanded the simulator beyond Rogue Trader-only play. Added new opening paths, Nexus of Shadows support, Whispers Beneath Footfall, the Unbeholden Reaches, The Green Signal, Necron lore, and stronger GM-style world movement.

2026.09.11 - Updated companion and NPC support with current DLC additions, including Eogunn Februs. Updated ambient NPC encounters so random worldbuilding introduces ordinary inhabitants of the Expanse rather than randomly dropping named companions into unrelated scenes. ROGUE TRADER: KORONUS EXPANSE