OSR Campaign Setting - Leigh Brackett Solar System Campaign Framework For OSR Rpg Systems

 The Leigh Brackett Solar System—often termed the classic "Planetary Romance" setting—blends hard-boiled noir, colonial exploitation, decadent alien antiquities, and melancholic space opera. Unlike the sweeping galactic empires of hard sci-fi, Brackett’s Solar System is a gritty, frontier-driven setting of trade companies, lawless outposts, dying alien races, and ancient cosmic mysteries across Mercury, Venus, Mars, and the Outer Moons.

Campaign Pillars & Tone

1. Elegiac Melancholy & Vanishing Antiquity: Alien races (Martians, Venusian tribes, Sun-folk) are ancient, decadent, and fading. Earth/Terran civilization is young, aggressive, commercial, and often predatory.

2. Hard-Boiled Planetary Noir: Protagonists are mercenaries, disgraced pilots, smugglers, relic hunters, and outlaws operating in gin joints, canal ports, and frontier outposts.

3. Pulp Science-Fantasy: Rayguns, heat-lance pistols, and space freighters exist alongside telepathic curses, ancient Martian sorcery-science, lost cities, and pre-human relics.

4. Colonial Tension: Earth Corporations (the Terran Trade Authority, Mining Consortia) exploit planetary resources and native populations, sparking rebellion and cultural clashes.

Key Worlds of the Brackett Solar System

1. Sun-Scorched Mercury

• Environment: A world of brutal extremes—tidally locked between twilight regions, blinding solar desert, and frozen dark-side glaciers.

• Inhabitants: The aboriginal Sun-folk (pale, fiery-eyed nomads adapted to high radiation and heat) and desperate human penal colonies/mining camps.

• Campaign Focus: Brutal survival, prison breaks, mining uprisings, and ancient radiation-resistant ruins buried in the twilight zone.

2. Jungle-Choked Venus

• Environment: A hot, humid swamp planet covered in vaporous mist, toxic ocean-seas, overgrown jungles, and winding canals.

• Inhabitants: Wild lizard-men, matriarchal river tribes, mysterious siren-women, and ruthless Earth rubber/timber monopolies.

• Campaign Focus: Jungle expeditions, canal-runner shootouts, ancient sunken temples, and native insurgencies against Earth trading posts.

3. Red Mars (The Drylands & Lost Cities)

• Environment: A dying, arid world of dusty sea beds, ancient dry canals, cold violet skies, and silent, ruined stone megacities.

• Inhabitants: Aristocratic Martian clans clinging to dead splendor, barbarian desert reavers, cold-eyed Earth artifact dealers, and half-human mutants.

• Campaign Focus: Tomb raiding in forbidden catacombs (Sinharat or Shandakor), ancient alien talismans, and clan feuds.

4. The Asteroids & Outer Moons

• Environment: Lawless mining rocks, pirate havens (e.g., Sark), and ice moons orbiting Jupiter and Saturn holding frozen, pre-human cosmic entities.

• Campaign Focus: Space piracy, smuggling illicit Martian dream-drugs, salvage missions on ghost freighters, and cosmic horror anomalies.

Main Factions & Power Brokers

Faction	Agenda	Key Assets / Threats
Terran Trade Authority (TTA)	Commercial hegemony, resource extraction, enforcement of Earth corporate law.	Gunships, armored colonial police, mercenary contracts.
The Martian Clan-Council	Preservation of ancient Martian nobility, secrecy of ancestral weapons and catacombs.	Psionic relics, ancestral assassin guilds, knowledge of dead cities.
Venusian Sea-Kings & River Cults	Driving Terran traders off Venusian waterways; protecting sacred swamp sanctuaries.	Amphibious war-barges, beast-mastery, poisoned weaponry.
Free-Trader Union / Smugglers	Profit through black-market trade (Martian relics, Venusian dream-lotus, illicit weapons).	Fast blockade-runner freighters, back-alley safehouses.

Core Campaign Arc: The Tomb of the Sun-King

An epic 4-act campaign designed to take a party of rogues, mercenaries, and disgraced scholars across the Solar System.

Act I: The Port of Dead Water (Venus)

• Premise: The party is hired in a smoky canal-side tavern in Jukhar, Venus, by a disgraced Terran archivist. The goal: retrieve a carved obsidian cylinder stolen from a Martian tomb before a rival TTA mercenary unit recovers it.

• Key Events:

  • Gunfight in the foggy docks against TTA enforcers.

  • Navigating a treacherous Venusian swamp to reach a hidden smuggler airship.

  • Translating the cylinder, which reveals coordinates on Mercury’s twilight ridge pointing to the Tomb of the First Sun-King.

Act II: The Sun-Dancer's Prison (Mercury)

• Premise: The crew travels to the mining penal colonies of Mercury. To reach the tomb, they must break out a blind Sun-folk elder who knows the secret paths through the radiation desert.

• Key Events:

  • Infiltrating a TTA orbital solar station/penal complex.

  • A high-speed trek across the blinding Terminator Line on Mercury in tracked crawlers.

  • Discovering that the "Tomb" is actually a stasis chamber holding a living pre-human warlord.

Act III: The Red Sands of Sinharat (Mars)

• Premise: The key to awakening—or destroying—the stasis chamber requires the Talisman of Rhiannon, buried beneath the dry seabed catacombs of Mars.

• Key Events:

  • Crossing the Martian wasteland alongside a band of fierce desert reavers.

  • Infiltrating a decadent Martian city ball hosted by a corrupt warlord selling ancient relics.

  • A subterranean dungeon crawl through non-Euclidean Martian catacombs guarded by psionic beasts.

Act IV: The Conjunction at the Asteroid Belt

• Premise: The TTA fleet, allied with a renegade Martian cult, converges on an ancient artificial asteroid-station where the Sun-King's superweapon rests.

• Key Events:

  • Boarding actions between smuggler vessels and TTA dreadnoughts.

  • A final confrontation inside the alien station where the party must decide whether to destroy the ancient power, claim it for themselves, or sell it to the highest bidder.

 D20 Leigh Brackett Random Encounter Table

d20	Encounter
1	A battered Terran tramp freighter drifts with scorched engines; inside, the crew is hypnotized by a Martian singing-crystal.
2	A Venusian canal-runner ambushes the party's barge using trained sea-serpents.
3	An Earth police inspector offers to wipe the party's bounties in exchange for assassinating a rebel leader.
4	A dust storm clears on Mars to reveal a towering ancient stone face whose eyes glow with cold purple energy.
5	A Mercury convict carrying a stolen pouch of raw solar-diamonds begs for passage off-world.
6	A disgraced Martian nobleman challenges a party member to a duel with ancient dueling-foils over an insult to his dead house.
7	A fog-shrouded Venusian village worshipping an amphibious cosmic horror demands a trade or tribute.
8	A barroom brawl breaks out in an Asteroid dive over a loaded game of interplanetary poker.
9	An alien artifact in the party's cargo begins whispering telepathic promises to whoever holds it.
10	A rival party of mercenaries tries to sabotage the party's ship fuel tanks before launch.
11	A solar flare hits Mercury, giving the party 10 minutes to find shelter before radiation roasts their suits.
12	A veiled Martian dancer in a low-G lounge slips a secret coded key into a player's pocket.
13	A TTA patrol gunship demands an immediate boarding inspection for contraband Martian artifacts.
14	An ancient temple door opens only when washed in human blood or high-frequency sonic resonance.
15	A desert reaver horde on armored riding-beasts surrounds the party's grounded airship on Mars.
16	A wounded mercenary warns the party about a "woman with golden eyes" who drains men's minds before dying.
17	An automated alien defense pylon unearths itself from the Venusian mud and targets all mechanical energy sources.
18	A rival smuggler offers a partnership to raid a TTA supply depot on the Moon.
19	A mysterious plague strikes a frontier town, turning victim's skin to translucent crystal.
20	A tear in space-time briefly manifests inside an ancient temple, showing a view of Mars when it was a lush, green ocean world.

Integrating Adventurer Conqueror King System II (ACKS II) with the legendary, chaotic, and maximum-gonzo DNA of Dave Hargrave’s Arduin Grimoires- d100 treasures & relics table from the Arduin rpg

 In Dave Hargrave’s Arduin Grimoire series (Volumes I–III and The Arduin Adventure), random treasure generation subverts standard fantasy tropes. Hargrave mixed high fantasy with sci-fi, cosmic horror, and weird fiction. This blog post picks right up from Integrating Adventurer Conqueror King System II (ACKS II) with the legendary, chaotic, and maximum-gonzo DNA of Dave Hargrave's Arduin Grimoires - Converting Arduin's Welcome to Skull Tower (1978) To ACKS II

Below is an authentic d100 Random Artifacts, Tech-Relics, and Exotic Treasures Table synthesized directly from the classic Arduin Grimoire tables and items—formatted for d100 random rolls in any classic OSR, ACKS II, or campaign setting.

The Arduin d100 Relic & Exotic Treasure Table

Roll 1d100 whenever PCs search a high-level vault, defeat an extraplanar entity, or loot a "Gonzo/Weird" dungeon chamber.

d100	Item Name & Description	Estimated Value / Rarity
01–02	Laser Pistol (3d6 Charges left): Range 120', deals 3d6 thermal damage (bypasses non-magical armor). Explodes on a natural 1.	Artifact / Sci-Fi
03–04	Phraint Glass Dagger: Carved from chitin-glass. Deals 1d6+2 damage; critical hits shatter the blade, dealing 3d6 piercing damage inside the target.	850 GP
05–06	Elven Starlight Cloak: Grants +2 AC and allows the wearer to blend into shadows (85% chance to hide indoors/outdoors).	2,500 GP
07–08	Ring of the Hell Maiden: Allows the wearer to summon a Hell Horse mount once per week. Wearer’s alignment shifts 1 step toward Chaotic.	4,000 GP
09–10	Vial of Bubble Man Juice: Throwable vial; bursts into a 10' cloud of sticky foam that entangles targets for 2d6 rounds (Save vs. Blast negates).	150 GP
11–12	Vorpal Cutlass (+2): Decapitates humanoids on a natural 20 roll. Intelligence 11, Ego 12 (Demands blood once per day).	8,000 GP
13–14	Power Cell (Small Core): Glowing blue cylinder. Restores 50 charges to First Age technology or deals 6d6 electrical damage if breached.	1,200 GP
15–16	Amulet of Soul Stone: Can absorb the soul of 1 slain enemy (up to 8 HD). Stored soul can be burned to cast a random 3rd-level Arcane spell.	3,500 GP
17–18	Obsidian War Pick (+3): Deals +5 damage against extraplanar creatures and allows the wielder to cast ESP at will.	6,500 GP
19–20	Dwarven Thunder-Cannon: Portable handheld hand-cannon. Deals 4d8 bludgeoning damage to a single target, but knocks the user prone.	1,500 GP
21–22	Scroll of Gathering the Sheaves: Clerical scroll that reassembles and resurrects dismembered or vaporized bodies.	5,000 GP
23–24	Alien Vibro-Blade: Ignores non-magical shields and armor bonuses. Deals 2d8 slashing damage; uses 1 energy cell charge per 10 rounds.	3,000 GP
25–26	Robe of the Rune Weaver: Allows the wearer to scribe magical runes onto physical media in half the normal time and cost.	2,800 GP
27–28	Bottle of Black Wind Mist: Sealed jar containing a fragment of the Black Wind. Opening it unleashes a 15' cloud of mind-draining horror.	Dangerous / Relic
29–30	Helm of the Iron Golem: Grants AC 8 (Ascending), but reduces base movement speed by half. Grants immunity to poison and mind-reading.	4,500 GP
31–32	Phasing Boots: Allows the wearer to step through solid stone or wooden walls up to 5' thick, twice per day.	3,200 GP
33–34	Wand of Yorgan’s Falling Forever: 1d10 charges. Targets affected fall upward into the sky for 1d4 turns unless anchored.	4,000 GP
35–36	Star-Metal Shield (+2): Reflects ray-based spells and laser beams back at the attacker on a successful Save vs. Spells.	3,800 GP
37–38	Neural Shock Whip: Deals 1d4 damage + targets must Save vs. Lethal or be paralyzed by nerve shock for 1d4 rounds.	2,000 GP
39–40	Scroll of Masayuki’s Mist of Malevolent Misery: Spreads a corrosive cloud dealing 1d6 damage/round to all inside for 1 turn.	1,200 GP
41–42	Gargoyle Wings (Grafted/Wearable): Grants 150' flying speed, but forces a Save vs. Poison upon equipping to prevent petrification.	5,000 GP
43–44	Ring of Anti-Cleric Magic Shell: Creates an antimagic field that specifically negates divine/clerical magic within 10'.	6,000 GP
45–46	Chthonic Blaster Rifle (1d8 Charges): Long-range heavy energy weapon. Deals 5d6 plasma damage in a 5' radius.	High Artifact
47–48	Greaves of the Amazon Champion: Grants +1 attack bonus with bows/spears and increases land movement speed by +30'.	2,200 GP
49–50	Dagger of Venomous Disintegration: +1 Dagger. Targets struck must Save vs. Poison or immediately disintegrate into gray ash.	9,000 GP
51–52	Crown of Cosmic Horror: Allows communication with alien entities. Grants +2 Wisdom, but causes 1 point of permanent Ego loss per month.	Rare Artifact
53–54	Scroll of Sulthoe’s Blaze of Glory: Caster explodes in a 30' radius firestorm (10d6 damage), but immediately dies (no save).	Priceless
55–56	Tome of Multiversal History: Reading this over 1 week grants 10,000 XP, but forces a Save vs. Spells to prevent permanent insanity.	10,000 GP
57–58	Sonic Grenades (1d4): Deals 3d6 thunder damage in a 15' blast; targets must Save vs. Blast or be deafened/stunned for 2d4 rounds.	400 GP each
59–60	Cloak of the Doom Guard: Wearer gains Regeneration 1 HP/round and shadow-blend abilities, but turns undead upon death.	7,500 GP
61–62	Staff of the Elemental Conjurer: Allows summoning of Air, Earth, Fire, or Water elementals 1/day without risk of loss of control.	8,500 GP
63–64	Potion of Flesh-Tasting Bad: Drinking this causes flesh to taste so foul that monsters have a 75% chance to spit the character out.	200 GP
65–66	Saurig Combat Harness: Fits reptilian/saurian humanoids. Adds +2 to AC and holds 4 quick-draw weapon holsters.	1,000 GP
67–68	Ring of Energy Drain Immunity: Protects the wearer completely from level-drain attacks by undead or extraplanar beings.	5,500 GP
69–70	Wand of Rhoar-eee’s Transit: 1d8 charges. Teleports the target and up to 3 allies to a known location within 50 miles.	4,500 GP
71–72	Silver Net of Entanglement: Restrains extraplanar entities or incorporeal ghosts. Cannot be broken by non-magical force.	2,400 GP
73–74	Mechanical Cybernetic Eye: Replaces an eye. Grants Darkvision 120', Detect Magic at will, and immunity to visual illusions.	6,000 GP
75–76	Scroll of Morgorn’s Red Death: Summons a cloud of magical crimson plague dealing 2d6 CON damage over 3 rounds.	2,000 GP
77–78	Gauntlets of the Ogremage: Sets Strength to 18 (+3 mod) and allows casting Invisibility once per day.	5,000 GP
79–80	Anti-Gravity Belt: Allows the user to float, hover, or reduce falling damage to 0 at will. Operates on internal battery cells.	4,000 GP
81–82	Bracers of Missile Deflection (+3): Grants +3 AC against ranged weapons, arrows, and physical missile attacks.	3,000 GP
83–84	Skeletal Key of Unlocking: Automatically opens any mundane or magical lock, but breaks after 1d6 uses.	1,500 GP
85–86	Phraint Hive-Spear (+2): +2 spear that deals double damage on a mounted or running charge. Inflicts acid poison on a crit.	3,500 GP
87–88	Lantern of True Sight: Illuminates hidden doors, invisible creatures, and illusions within a 30' radius cone. Burns standard oil.	3,200 GP
89–90	Alien Med-Kit (3 uses): Instantly heals 4d8+4 HP and cures all non-magical poisons and diseases when applied to a wound.	1,800 GP
91–92	Ring of Demon Command: Allows control over Lesser Demons (Save vs. Spells applies). If the target saves, it attacks the wearer.	7,000 GP
93–94	Potion of Berserker Rage: Drinker gains +4 to Attack and Damage, +20 Hit Points, but cannot cast spells or retreat for 1 turn.	500 GP
95–96	Scroll of Korgen’s Cloud of Kindness: Pacifies all creatures within a 40' radius unless they save vs. Spells with a -2 penalty.	1,800 GP
97–98	Vorpal Greatsword (+3): Decapitates on a natural 19–20. Sentient (Int 14, Ego 16). Demands to lead the party into battle.	Major Artifact
99	The Pitchfork of the Under-Lord: Legendary +4 weapon. Fires 8d6 hellfire blasts (3/day) and grants complete fire/heat immunity.	Relic
00	Roll 3 Times: Roll three times on this table (ignoring any future rolls of 00) and take all three items!	Special

Campaign Rules for Arduin Loot

• Cross-Genre Identification: Characters with sci-fi technology (laser pistols, power cells, vibro-blades) who do not possess a relevant proficiency (e.g., Engineering, Ancient History, or Arcane Artifice) must make an Intelligence Check when first trying to operate the item. A failed check indicates a mechanical jam, while a roll of 1 indicates a catastrophic battery explosion.

• XP for Sci-Fi Relics: In gold-for-XP systems (like ACKS II or classic B/X), high-tech loot can be sold to sages, mages, or collectors for the full GP value listed above, converting directly to character Experience Points.