Thryxil

“Beneath stone and silence, they wait—not for time, but for stars.”
— Excerpt from A Treatise on Pre-Sapient Civilizations, by Caelia Varistus

The Thryxil are a rare, metamorphic species native to the deep crust caverns beneath the Riftlands. In their early form, they resemble eyeless, wormlike creatures with soft exoskin and rudimentary social instincts. But upon exposure to unfiltered celestial light—especially from the Rift moon Tharaxis—they undergo a complete transformation: erupting into bipedal, bioluminescent beings of intelligence and grace.

Their emergence is rare, often mythologized by deep-folk and frontier mages alike. Imperial classification debates whether the post-metamorphosis Thryxil constitute the same species or represent a magical divergence.

Thryxil by Mike Clement and OpenAI

Basic Information

Anatomy

Dormant Form:

  • Length: ~1.2 meters
  • Segmented exoskin with mineral absorption pores
  • No eyes; tactile antennae and echo-sensitive ribs

Awakened Form:

  • Height: ~2 meters
  • Thin-limbed and upright, with translucent skin glowing with internal runes
  • Complex vocal organs produce harmonic language
  • Cranial filaments resemble radiant plumes

Genetics and Reproduction

Asexual in larval form (splitting via fission). Reproductive method post-metamorphosis is unknown—no “young” Thryxil Lux have been observed.

Growth Rate & Stages

  • Dormant for centuries unless exposed to celestial light
  • Metamorphosis occurs within 3 days of exposure
  • Newly awakened Thryxil emerge with fully formed cognitive ability, suggesting memory transfer or emergent sapience

Ecology and Habitats

  • Subterranean fissures rich in Riftstone
  • Prefer mineral-heavy, moist, echo-dense zones
  • Avoid natural caverns with surface skylight

Dietary Needs and Habits

  • Dormant: Mineral osmosis—absorbing nutrients from rock and fungi
  • Awakened: Unknown; presumed to convert light or draw from deep-root aether

Biological Cycle

Largely static in larval form. Metamorphosis is not seasonal but tied to light exposure—particularly from celestial sources such as Tharaxis.

Behaviour

  • Dormant Thryxil form tight clusters, sharing warmth and echo-space. Non-aggressive.
  • Awakened Thryxil demonstrate high logic, curiosity, and reluctance to harm. They emit mournful light songs when isolated.

Additional Information

Social Structure

Dormant: hive-nest instinct.
Awakened: solitary or dyadic pairs

Uses, Products & Exploitation

None sanctioned. Black-market “Thryxil Cradle Resin” is said to prolong mage life, extracted unethically from cocoon fragments.

Average Intelligence

Pre-sapient (Nullus), high intellect (Lux)

Perception and Sensory Capabilities

  • Dormant: Vibration and mineral-echo sensitivity
  • Awakened: Bioluminescent pulses as language; high-frequency hearing; presumed aetheric empathy

Symbiotic and Parasitic organisms

Glowspore Mycelia—used to “mark” celestial-safe caverns

Scientific Name
Subterramuta Luminara
Origin/Ancestry
Two known phenotypes: Dormant Form (Thryxil Nullus): Larval, communal, nearly blind, biologically inert to most stimuli. Awakened Form (Thryxil Lux): Sapient, bioluminescent, vocalizing via harmonic pulses.
Lifespan
Lifespan: Dormant — ~400 years without metamorphosis Lifespan: Awakened — unknown
Conservation Status
Under Arcanii Interdiction 771b – “Do not disturb or harvest Thryxil larvae under penalty of magical treason.”
Average Height
~2m (Lux form)
Average Weight
~35kg (hollow bone structure)
Body Tint, Colouring and Marking

Pale amber, opaline shimmer (Lux)

Discovered by

Cover image: by Mike Clement and OpenAI

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