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The Frosthearth

A planet orbiting a K-type orange dwarf star, significantly cooler than Earth. Its atmosphere is rich in nitrogen and carbon dioxide, with a lower oxygen content, leading to a denser, greenhouse-warmed atmosphere despite the cooler star. Liquid water exists primarily in subsurface oceans kept liquid by geothermal activity, with only small, ephemeral surface lakes and rivers in equatorial regions. Dominant habitat is subterranean, within vast cave systems and ocean trenches.

Frosthearth Siren

Evo 3PredatorEats animalsShallows / ShoreResilient

Shaped by ❄️ deep cold

A more robust, cold-adapted predator, the Frosthearth Siren has traded some of its dazzling bioluminescence for insulation and the ability to hunt by sensing the faint heat signatures of prey in the increasingly frigid subterranean waters.

thicker blubber layerreduced bioluminescenceenhanced heat-sensing pitsslow metabolismrobust jaw structure
Size
75 cm
Diet
carnivore
Habitat
subterranean oceans
Moves by
undulating fins

Why it evolved

The sharp climate cooling driven by the pressure selects for traits that conserve heat and improve hunting in lower temperatures. The Frosthearth Siren develops a thicker blubber layer for insulation, a crucial adaptation for survival in the colder subterranean oceans of Frosthearth. Its metabolism slows to conserve energy, and it enhances heat-sensing pits to locate prey, such as the Geothermal Pneume, which are less visible as surface temperatures drop. This adaptation comes at the cost of reduced bioluminescence, making its mating displays less effective but improving its predatory efficiency.

What changed from Glimmering Siren

Gained:+ thicker blubber layer+ reduced bioluminescence+ enhanced heat-sensing pits+ slow metabolism+ robust jaw structure
Lost:enhanced bioluminescent displaylarger light organsbroader finsreduced sensory tendrilsslightly smaller size
  • Size: 70 cm 75 cm
🐅Chthonic Hu…Evo 1🐅Glimmering …Evo 2🐅Frosthearth…Evo 3🐅Abyssal Sir…Evo 4🐅Haline Lurk…Evo 5🐅Haline Over…Evo 6🐅Haline Scav…Evo 7🐅Abundant Ve…Evo 8🐅Abyssal Ven…Evo 9🐅Abyssal Ven…Evo 10🐅Vent Scaven…Evo 11
  • resilient
  • strained
  • fragile
  • ★ canon
  • 🧬 hybrid
  • 💀 extinct
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