Mosaryn Volcanic Island

Geography

The Mosaryn Volcanic Island is an enormous, violently geological landmass in the geologically unstable southern oceanic belt of the Twilight Age world. Created from an abyss deep sea fracture uplift, the island is a hostile, brutal landscape of basaltic precipices, collapsed calderas, and vast ash plains. Different from Kudapa's sweltering bogs or Engale's wind-carved canyons, the characteristic of Mosaryn is the incessant geological violence between the island's heat, the tumultuous ocean storms and the sheer mineral substance of the island.

Topography and Geology

The topography of the island extends in a radiation pattern outwards from a huge volcanic structure in the center. The highlands are impossibly steep slopes covered in solidified lava, razor sharp obsidian shards, and erosion trenches formed by sudden seasonal water flow. Interspersed with the highlands are the remains of countless old calderas, mostly collapsed and covered with drifting ash, highly acidic geothermal pools or tiny cones of new volcanic matter from recent eruptions.

The geological structure of Mosaryn never stands still. Even during long dormant periods there are many fumaroles, sulfuric fissures, and molten heated rock throughout the highlands. The coastline is similarly severe, sheer basalt cliffs plummeting into the ocean and breaking the surface in sharp black sand beaches or newly formed expanding lava deltas. With time, powerful waves are eroding away volcanic plates on the coast, while collapsed lava tubes beneath form an unstable network of sea caves.

Climate and Hydrography

The climate of Mosaryn consists of intermittent bursts of oceanic storm fronts and the island's powerful geothermal output. The coast is under constant siege by dense, salt-infused winds and pervasive dampness, while the highlands remain deceptively dry; intense ground heat and porous ash soil keep it perpetually dry. Microclimates on the island fluctuate with unpredictable rapidity, especially around hot vents where dense sulfuric steam often blankets the island in sudden, impenetrable whiteouts of fog.

Fresh water resources are virtually non-existent. The basalt soil of the island is incredibly porous and most heavy rainfall disappears quickly into vast fissure networks within the basalt that form a complex series of pathways that bring most of the water into contact with volcanic heat, returning it to the surface as boiling geysers, hot seeps and steaming wetlands. During peak storm season however, the island can be inundated with temporary rivers that usually boil or disappear before reaching the sea.

Traversability

Navigating Mosaryn is a difficult and potentially deadly prospect. The island itself represents a clear danger, and the ground itself is treacherous with seismic tremors causing lava crusts to crack, concealing a bubbling hot sink hole underneath, and unnoticeable pockets of toxic sulfur gas fill the air. Safe routes are primarily limited to the ancient weathered basalt ridges and high coastal pathways that have long since cooled and have a slightly diminished risk of eruption from within.

Plants

Canopy Vegetation (Highland Extremophiles) '*Note: There is no traditional "canopy" in the traditional sense on Mosaryn due to the highly extreme environment. This is highest elevated plant life present.'

The plant life of the Volcanic Island of Mosaryn is sparse, highly specialized and harshly limited by geologic violence. The upper island is a mostly dead zone of constantly shifting lava fields, lethal fumaroles, and choked ash drifts. Vegetation is only truly stable in the oldest basalt ridges, hardened caldera interiors, and protected coastal shelf. The flora of the volcanic highlands is dominated by sprawling extremophiles with very low growing forms. These plant species survive by feeding on nutrient deficient, toxic basalt sediment and with virtually no surface moisture.

The thick, leathery cuticles that cover these plants protect them from the constant blast of ash and highly acidic precipitation. This flora possesses unnaturally dark hues-ranging from coal black to a deep, muted crimson-owing to massive heavy-metal accumulation. Some plants found in dangerously heated geothermal areas develop calcified, stone like exoskeletons protecting their internal vascular system from steam vents or even magma fissures.

Sub-canopy growths (Ashplain pioneer flora)

Scattered throughout the large calderas is a hyper-adaptive pioneer flora. These growths survive by burrowing deeply under the substrate during volcanic events, only breaking the surface during rare periods of cooling. When the conditions allow the ash plain growths have incredibly fast, aggressive cycles of reproduction. Their roots explode outward into the ash, seeking to establish a hold before tremors and ashflows wipe the land clear again. Growth is unpredictable.

Due to erratic nutrient distribution among the ash plains-clusters of hardy brush may cling to subterranean mineral seeps, or bare ground might stretch between two equally barren zones. Entire colonies are periodically smothered under fresh lava and remain so for decades before new growths push through the crust.

Floodplain basin flora (Coastal and geothermal seeps)

The majority of Mosaryn's bio-mass is concentrated on the island's precipitous coastal ledges and around the volcanic thermal seeps. Heavy sea mists combine with hot groundwater to foster dense plant communities around coastal springs, old lava flows, and geothermally active wetlands. Coastal regions of the ledges feature salt-loving halophytes with a wide, flexible stem. These are well-adapted to the harsh, constantly changing oceanic gales. Areas around the hot geothermal seeps feature different growths.

Densely packed heat-loving mosses, hardy, Reed-like vegetation, and encroaching fungal colonies. The thermal seeps are fed by hot deep-groundwater, remaining biologically active year-round.

Seasonal changes (Eruptive cycles)

There is no truly predictable seasons in Mosaryn; only eruptive cycles, and every cycle demands survival at its most primitive level. Survival dictates specialized root-storage,calcified heat protection and ability to stay dormant for years under suffocating, toxic ash. During relatively long periods of geological calm, these older areas would be verdant and green, shifting crimson as life returns. However, the first tremor will blast these growing lands apart in moments; as a geological fissure opens to spit lava, it may simultaneously shatter land several miles away in a rain of fiery dust.

Animals

Highland Predators (Summit Extremophiles)

Life on Mosaryn Volcanic Island is a constant struggle against brutal geothermal instability. Sparse permanent biomass survives on the upper volcanic slopes and within choking ash fields, forcing native species to engage in hyper-territorial, hyper-opportunistic lives. The apex predators of the highland areas are lightly built and incredibly agile, built to scale sheer obsidian cliffs and crumbling basalt ridges; their lightweight structure also allows them to skim lightly across brittle lava crust.

Thick, heavily callused feet are adapted to both the blisteringly hot surface and the incredibly sharp volcanic glass and basalt, while long limbs give them an extreme grip on precarious surfaces. Animals hibernate during intense periods of geothermal venting by delving into deep, cooled lava tubes and cracks, waiting until the surface cools again. As prey is incredibly rare, these creatures fiercely defend territories centered on vital geothermal vents, temporary runoffs of fresh water, and shallow calderas where opportunities for survival are abundant.

Ashplain Scavengers (Pioneer Fauna)

Densely packed ash fields covering older eruption sites are home to highly adapted scavengers and detritivores. Operating in an environment of virtually zero visibility due to pervasive ash fall, these animals primarily rely on highly sensitive seismic detection and chemical sensing abilities. Many scavengers are partly subterranean, burrowing themselves into loose, insulative ash during eruptive periods, as they have very efficient lungs and insulating bodies, and a reflective outer layer that helps protect against heat from eruptions.

After major seismic events, animals rapidly migrate and colonize newly formed geothermal pools and the carcasses exposed. As the geothermal ecosystem begins to die, the food web collapses, leading to extreme periods of starvation.

Coastal and Thermal Fauna (Geothermal Basin Species)

The vast majority of Mosaryn's biomass clusters along the coast or around thermal seep systems. Coastal grazers have incredibly broad feet and low centers of gravity to negotiate treacherous, slippery lava and basalt. More deeply inland, geothermal pools and steaming fens support populations of amphibious creatures. Since the underground groundwater is constantly hot, these small, geothermal ecosystems never freeze or go into stasis and thus support year-round food webs.

Predators within the thermal pools and seep systems use the abundant geothermal steam fields as a natural screen to allow for covert predation. Food webs within localized seep zones flourish year-round, entirely sustained by the subterranean heat sources.

Behavioral Cycles (Eruptive Migrations)

Animals within the ecosystem do not migrate according to seasons; instead, migratory behavior is dictated by eruptive cycles. Animal populations flourish when volcanic activity dies down and animals spread from coastal and thermal sources out into the deeper calderas and cooled lava fields. When volcanic activity erupts, populations quickly contract as animals flee back towards the coast or the depths, avoiding toxic gasses, flashing flood events, and pyroclastic flow.

Hunting grounds are consumed by lava flows with incredible speed but take many decades to cool and become a viable hunting ground once again.

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