Adapting North West of Earth By C.L. Moore - Orbital Decay (MicroRed version) From The Red Room & The New Flesh Rpg - d100 Random Monoliths, Henges, & Lairs Table

 In the classic tradition of planetary romance, the desolate surfaces and mist-shrouded frontiers of the Solar System are dotted with mysterious alien monoliths, ancient stone henges that harness cosmic energies, and dangerous lairs harboring outlaws, cultists, and prehistoric beasts.

Below is a d100 Random Monoliths, Henges, & Lairs Table for old-school pulp science-fantasy campaigns.

01–25: Martian Monoliths & Dryland Lairs

d100	Landmark / Lair	Features, Hazards, & Encounters
01–02	The Obsidian Needle of Lakkdarol: A 200-foot black spire in the red dust.	Vibrates in the presence of telepaths; causes severe nosebleeds if touched without leather gloves.
03–04	The Red-Reaver Warrens: Subterranean cave network beneath a dry seabed.	Lair of 30+ Martian desert bandits and their armored, six-legged riding-beasts.
05–06	Henge of the Dying Sun: A ring of petrified bone-pillars on a high ridge.	Focuses sunlight into a searing laser beam at high noon; worshipped by local nomads.
07–08	The Screaming Monolith: A sandstone pillar carved with thousands of tiny whistles.	Desert winds blowing through it create a deafening howl that causes temporary madness.
09–10	The Sand-Burrower's Pit: A massive conical pit in the shifting dunes.	Lair of a giant armored sand-worm; holds digested remains of Terran prospectors and their gear.
11–12	Monolith of the Twin Moons: A granite slab depicting Phobos and Deimos.	Projects a hard-light bridge across a deep canyon when both moons align overhead.
13–14	Cult Lair of Phorag: A subterranean den hidden behind a fake canal wall.	Cultists actively preparing to sacrifice a kidnapped Terran diplomat to a slumbering shadow-beast.
15–16	The Crystalline Henge: A circle of towering quartz monoliths in a dried crater.	Amplifies energy weapon fire tenfold, but randomly reflects shots back at the shooter.
17–18	Lair of the Glass-Spiders: A network of translucent webs stretched across a ravine.	Giant predatory arachnids that camouflage perfectly against volcanic glass.
19–20	The Basalt Stele of Shandakor: Covered in glowing, non-humanoid runes.	Translating the text grants knowledge of a forgotten tomb, but causes permanent night blindness.
21–22	Smuggler’s Hideout at Valkis: An abandoned aqueduct converted into a fortified camp.	Stocked with illegal rayguns, canal-wine, and black-market star-charts; guarded by automated turrets.
23–24	Henge of the Sea-Kings: Giant stone arches standing in what was once an ocean trench.	Gravity inside the ring is reduced to zero; ghost-like apparitions of ancient ships float within.
25	The Monolith of the Iron Mind: A metallic spire buried up to its tip in sand.	Emits a 1-mile psionic field that forces all sentient beings to speak only absolute truth.

26–50: Venusian Swamp-Henges & Jungle Lairs

d100	Landmark / Lair	Features, Hazards, & Encounters
26–27	The Ironwood Henge: A circle of massive, petrified trees bound by heavy brass chains.	Sacred site of the Lizard-Men; stepping inside the circle cures all toxins but angers the spirits.
28–29	Lair of the Swamp-Drake: A murky cavern beneath a giant mangrove tree.	Territorial reptilian apex predator guarding a clutch of glowing, highly valuable eggs.
30–31	The Siren’s Spire: An obsidian monolith jutting out of the fog-covered Red Sea.	Emits a hypnotic harmonic hum that causes ship captains to steer straight into surrounding reefs.
32–33	Pirate Encampment of Crom Dhu: Fortified wooden palisade built on stilts over a marsh.	Base for 20 canal-runners; contains stolen Terran Trade Authority cargo and heavy swivel-cannons.
34–35	Henge of the Bog-God: Sunken stone pillars covered in glowing bioluminescent moss.	The moss acts as a powerful incendiary fuel if scraped off, but inhaling its spores causes choking.
36–37	The Minga Cult Outpost: A pristine white-stone pavilion hidden in deep jungle.	Breeding sanctuary for elite female assassins; protected by invisible gas traps and blowgun snipers.
38–39	Monolith of the Deep Swimmer: Carved in the image of a tentacled leviathan.	Bleeds black, viscous oil during heavy rain; touching the oil grants water-breathing for 24 hours.
40–41	Lair of the Carnivorous Lotus: A serene glade dominated by a giant, crimson flower.	Hypnotizes prey with sweet scents before dragging them into an acid-filled central pod.
42–43	The Mist-Grotto Henge: Ring of dripping basalt columns inside a steaming thermal cave.	Surrounded by vapor that corrodes metal armor and optics within minutes.
44–45	Renegade TTA Outpost: A crash-landed gunship converted into a mercenary fortress.	Heavily armed Terran deserters running an illegal Venusian rubber and timber operation.
46–47	The Jade Monolith: A smooth, flawless green pillar 50 feet tall.	Absorbs heat from its surroundings, freezing the air within 30 feet into solid frost.
48–49	Lair of the Amphibious Reavers: A flooded cavern accessible only by diving under a riverbed.	Hideout for wild river-tribes equipped with poisoned spears and trained sea-serpents.
50	Henge of the Broken Sky: Ancient stone arches holding a suspended, glowing plasma orb.	The orb recharges empty energy weapons instantly, but unleashes a lightning bolt if overloaded.

51–75: Mercurian Sun-Spires & Darkside Lairs

d100	Landmark / Lair	Features, Hazards, & Encounters
51–52	The Solar Needle: A chrome monolith on Mercury's day-side that reflects light for miles.	Can be seen from orbit; standing in its shadow is the only way to survive the scorching daytime heat.
53–54	Lair of the Sun-Folk Nomads: A network of lava tubes beneath the twilight ridge.	Home to 50+ thermal-adapted nomads; fiercely protective of their subterranean water stills.
55–56	Henge of the Frozen Core: A circle of jagged black ice-spires on the dark side.	Drains thermal energy; exposure reduces suit power reserves by 10% per minute.
57–58	The Outlaw Mining Camp: An unlicensed excavation rig clamped onto a cliff wall.	Desperate prospectors guarding a rich vein of solar-diamonds with heavy mining lasers.
59–60	The Monolith of Shannach: A towering hexagonal column of dark basalt.	Whispers ancient mechanical secrets directly into radio headsets; risks permanent brain damage.
61–62	Lair of the Rock-Mites: A hive of burrowing, silicon-based creatures in a deep canyon.	Creatures consume metal and energy cells; will attack starship hulls if landed nearby.
63–64	Henge of the Terminator Line: A ring of stone pillars built exactly on the day/night boundary.	Tracks the planet's rotation mechanically, slowly rolling across the landscape on ancient gears.
65–66	The Scorch-Zone Vault Lair: An abandoned bunker covered in heat-reflective plating.	Base for high-tech artifact smugglers operating under the noses of Terran patrols.
67–68	The Lead-Melt Monolith: A spire made of solid lead that partially liquefies during peak daytime.	Re-solidifies at night, trapping anything resting against it in dense metal.
69–70	Lair of the Darkside Shades: A pitch-black cavern system below freezing glaciers.	Inhabited by incorporeal shadows that feed on body heat and life-will.
71–72	The Sun-Dancer’s Pillar: A carved ivory-like stone column atop an extinct volcano peak.	Focusing point for intense solar radiation; grants immunity to heat to anyone who survives its trial.
73–74	Penal Colony Escapee Hideout: A ruined mining shaft repurposed by fugitive convicts.	Rigged with crude explosives and improvised thermal whips; suspicious of all off-worlders.
75	The Gravity Monolith: A squat, heavy pillar carved with interlocking rings.	Generates a localized 3G gravity field in a 100-foot radius, crushing unprepared intruders.

76–100: Outer Moons, Asteroid Henges, & Deep Space Lairs

d100	Landmark / Lair	Features, Hazards, & Encounters
76–77	The Asteroid Henge: Twelve massive boulders tethered together in a ring orbiting a dead rock.	Holds a breathable atmosphere inside the ring via an invisible, ancient force-field.
78–79	Pirate Haven of Sark: A hollowed-out asteroid fitted with docks, saloons, and repair bays.	Lawless outpost filled with smugglers, bounty hunters, and corrupt corporate agents.
80–81	The Monolith of Europa: A translucent blue ice-spire frozen into Europa’s ocean crust.	Projects holographic maps of Jupiter's moon system as it existed ten million years ago.
82–83	Lair of the Void-Beast: A dark crater on a rogue moonlet littered with ship wreckage.	Home to a massive vacuum-breathing predator that attacks passing freighters with magnetic pulses.
84–85	The Phobos Obelisk: A metallic black pillar standing on Mars's inner moon.	Periodically emits a long-range beacon signal directed toward an empty patch of deep space.
86–87	Cult Lair of the Cosmic Mind: A abandoned research station built on a Saturnian moon.	Fanatics worshipping a sleeping entity; equipped with brain-washing devices and ray-rifles.
88–89	Henge of the Shattered World: Floating stone fragments in the Asteroid Belt forming a archway.	Acts as a spatial gateway; passing through teleports ships instantly to Mars orbit.
90–91	The Ghost-Freighter Lair: A massive, dead Terran dreadnought drifting without power.	Repurposed as a fortress by space-pirates; guarded by rigged airlocks and automated turrets.
92–93	The Lunar Monolith of Paradise: A white marble spire in a crater on Earth's Moon.	Surrounded by a field that restores physical youth, but slowly erases the visitor's memories.
94–95	Lair of the Star-Vampires: An ancient stone temple anchored to a comet's tail.	Parasitic energy entities that stalk intruders in complete silence and near-invisibility.
96–97	The Null-Zone Monolith: A strange, non-reflective pillar drifting freely in space.	Cancels out all electrical currents, raygun cells, and radio signals within a 5-mile radius.
98–99	Henge of the Elder Gods: Giant stone monoliths carved into terrifying, non-human faces on Titan.	Standing between the pillars causes intense psychic visions of the birth and death of the universe.
100	The Omega Monolith: A planetoid-sized structure floating at the edge of the Solar System.	Contains a control room capable of altering the orbit of any planet in the system.