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Mount Sedimus

The dormant Mount Sedimus rests twenty miles south of Metropolis Volcano, both inside of Karkhalan territory. This volcano is famed for its helsaurus colony; the entire northern face of the mountain is covered in dinosaur nests.

Mount Sedimus forms part of the Ormasu Range. Dust storms swallow up the volcano during the cold season, casting peculiar shadows on the surrounding lands. Many of those that work in close proximity to this mountain tell tales of mysterious figures lurking around.

Geography, Location & Climate

Ormasu Range

It may not be the largest, but it is the most well known mountain range on Hell. Metropolis Volcano is its capital.
  It is the tallest mountain range on the planet, with twenty-five of the thirty tallest peaks.

Mount Sedimus stands approximately 1,507 metres above magma level. The volcano is composite, built from thousands of layers of compressed ash, volcanic rock, and thick magma. Mount Sedimus has formed along the Ormasu Subduction Zone, where the Mascriff Plate rolls underneath the Armasai Plate.

Ash fields wrap around Mount Sedimus, consuming and feeding the local plant life in a strange cycle. This ash flows from the volcano even in its dormant state, which it has been in for the past two hundred years.

History

Hell has never cultivated sophontic life; all of its inhabitants hail from various planets across the Milky Way. The Ormasu Range is controlled by Karkhala and the oanie, after commandeering it from Saturn nearly two hundred years ago. Karkhala expanded its territories east in order to claim this entire mountain range, for access to these volcanoes.

Zinacore Logo by Mochi

Mining operations have begun at the base of Mount Sedimus, in order to extract a number of precious minerals, including but not limited to: gold, silver, bauxite, semestriite, and malasite.

Karkhalan mining company Zinacore currently operates on the southern face of Mount Sedimus, extracting malasite and other precious ores.

The company has dealt substantial damage to Mount Sedimus. Thirteen years ago, drilling equipment ruptured volcano, nearly causing it to reactivate. Despite the volcano not actually erupting, tremors caused significant damage to expensive equipment, and forced workers to relocate.

Ecology

Firepede by Mochi

Outside of nesting season, Mount Sedimus sees little life. Tall spiny grasses thrive in the ash fields, with dithering euphora trees tearing up volcanic soil. Giant firepedes scuttle through the fields, hunting down wild herd animals grazing on the overgrowth.

Helsaurus, apaticeratopses, and a number of other large dinosaurs nest on the north face of Mount Sedimus. On this face, magma flows incredibly close to the surface, incubating eggs tucked into small holes even while parents are not around.

Egg hunting dragons, such as borotars, prey on eggs left unmonitored. Some predators will even lie inside the nest in wait, oblivious dinosaurs laying eggs directly into a gaping maw.

Burning spirits hide amid dust storms around the mountain. As blisteringly hot haboobs roll over the mountain, swallowing up factories dotted around the volcano's base, these spirits hunt under the cover of darkness. Any sudden disappearances of workers is chalked up to dust storm fatalities, leaving the burning spirits as nothing more than legends in the eyes of those that live on Hell.

Type
Volcano
Location under
Inhabiting Species
Related Materials

Related Articles

Helsaurus
Species | Apr 24, 2026

A species of dinosaur native to Hell. Extremely territorial, posing a great threat to the workers on the planet.

Hell
Geographic Location | Apr 5, 2026

A planet in the Kurhira System.

Karkhala
Geographic Location | Apr 5, 2026

A planet in the Kurhira System. Karkhala is the home planet of the oanie, opportunistic predators of space that like to take control of uninhabited planets for their own nefarious reasons.

Osao[ show ][ hide ]
Atlas
Aecotia Aerawich · Apalous Desert · Arid Flatlands · Ink Kingdom · Inky Isles
Ecela Coral Desert · Ecela Plains · Elder Tentacle Tree · Fic Saca · Sakara (Head Legional Mansion · Sakara Birdwatching University · Sakara Fishing Platform · Seaslime's Whart)
Eudan Apalous Vein · Blue Plateau · Coral Mountain · Dove's Tail Desert · Dove's Wing Desert · Eccentric Meadows · Eudan Sea · Forest of Beauty · Gala Reien · Marsh Forest · Mavini · Sparkling Sodalands (Sour Lake)
Uaelor Blubber Dun · Burning Slopes · Carrot Lands · Epithelial Rhym · North Uaelor Coralspikes · Nylis Meadows · South Uaelor Coralspikes · Uaelor Red Desert · Xexiala
Unuth Dark Umbrella Forest · Dragon Forest · East Unuth Coralspikes · Teal Umbrella Forest · Unuth Glitter Forest · Unuth Orange Desert · Unuth Red Desert · Zcarazas Plains

  Carawin Trench · Epystal Islands · Osao Ocean · Pelican Isles · Xivin
Peoples
CharactersBoner · Lunar Grove · Manara Matara · Slippa Bob · Solotolo Soosoo
CuisineFerrous Banana Tart
OrganisationsBooty Cruises · Ephenic Empire · Osao Space Legion · Osaoan Wildlife Preservation Society
ProfessionsHex Queen · Slime Generator
Ethnicities & GroupsSparkling Slimes
Cultural PracticesHex Queen Ceremony · Slimeball · Slime's First Birthday

  Slime Culture
Knowledge
Conditions & AfflictionsAephaestaemalaesiea · Bloating · Duochromatica · Excess Slime Production · Goldcap · Slime Rot
Historical EventsOsao's Exploration into Greater Kurhira
DocumentsBird Watcher's Journal · Epystal Islands Native Wildlife Protection Act 1008 · Ink Kingdom Environment Act 646 · Top Universities in Osao
PhenomenaPink Hailstorm
Items & ArtifactsCurrencies (Irunat · Pijhi Popp) · Banana Hammer · Lava Cream
Materials & ResourcesSeastone
Science & TechnologyBooty Cruise Ship
Biota Ecology of the Dragon Forest · Slime · Sea Slugs of Osao · State Birds of Osao
 
FaunaAzure Pelican · Bapycara · Benthic Rainbow Worm · Bulkhead Dolphinfish · Cottonball Cottonball · Death Pig · Echinops · Faintwing · Firecracker · Firehead · Gelletti's Penguin · Glossy Holehead · Gold-Crested Crow · Gongdu · Lace-Fingered Brittle Star · Lemonwing · Nasanaleiidae · Pale Catfish · Palm Glider · Rainbow Worm · Shiverfish · Shurtle · Urchinfish
FloraCaraweed · Lavaweed · Purple Banana Tree · Shedding Wig · Tangle Fern · Wigglejiggle
FungiRed Waxcap
Misc. Osao Art Gallery · Osao Calendar

 


Cover image: Hell Header by Mochi

Comments

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Apr 9, 2026 15:04 by Rin Garnett

I'm not surprised such an unpleasant place is only inhabited by the incredibly unpleasant oanie...

⭐ Cause problems in wow that's a lot of stars
✏️ Add yourself to the World of Worlds
Apr 10, 2026 17:52 by Mochi

Yeaaahhh, thankfully they don't own this entire planet!

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Apr 25, 2026 10:35

Sounds like quite the dangerous place! The critters still surviving there, are probably tough as nails. The firepedes probably would give me nightmares seeing one xD

At the end of everything, hold onto anything.
Apr 25, 2026 15:06 by Mochi

Lots of very powerful creatures here! I would like to draw more :D

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I hope you have a great day!   Explore the endless planets brimming with life of the Yonderverse! Go after creatures, discover new places, and learn about the people you find along the way. While you're at it, come visit the A to Zoo, the Yonderverse's largest zoo!
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