Wasteland Bestiary

WLS FIELD SURVEY · creatures synthesized from real pre-Fall science · fiction outside, citations inside

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WLS-0012 · CANON RECORD

Reefsong Arrowworm

Chimera — Bio-engineered Polychaete

“Whispers in the deep weave resilient coral from ruin”

Generated portrait of Reefsong Arrowworm: Chimera — Bio-engineered Polychaete
2threat
7vitality
4armor
5speed
6cunning
COMMON A pre-Fall marine resilience project, because of course it was. They gene-spliced Sagitta elegans with coral polyps to create rapid-adaptive reef builders for tectonically active zones. Then the Fall happened, and now they're just another feral solution to a problem you didn't know you had.

Special Ability

◈ Seismic Weaving

They detect microseismic vibrations through their lateral line analogues, then excrete a rapidly hardening coralcrete that bonds to metal and rock, sealing fractures and incorporating debris into structures more resilient than your future.

HabitatThey adore deep-sea thermal vents, quake-shattered abyssal plains, and any submerged ruins foolish enough to sit along tectonic boundaries in the Rust Meridian. Typically between 150–250m down, where the geothermal warmth keeps their obnoxiously cheerful colonies glowing.
DietThey snack on microscopic plankton, sip dissolved minerals from vent fluids, and hoover up silicate particles from seismic debris fields. The perfect diet for a creature whose main hobby is structural engineering.
BehaviorThey swarm in pulsating, communicative clouds, synchronizing their bioluminescent patterns to gossip about fracture points in the seabed. After a quake, they mass-aggregate to vomit rapid-hardening coralcrete over fissures, often entombing anything—or anyone—salvageable in the process.

Field Notes

After the '26 Tongan aftershock swarm, these delightful little menders erupted by the thousands, painting the abyssal fractures in frantic blue-green light like some deranged nervous system. They don't flee from your clunky diving suits—oh no, they embrace them, treating your precious salvage as just another lovely skeleton to be smothered in their cement.

Their secretions aren't some primitive coral ooze; it's a clever polymer-biocement hybrid that actually improves under pressure. Get caught in a feeding frenzy and you'll become part of the architecture. Some clever survivors actually cultivate them to patch their underwater bases—a truly inspired way to risk becoming a decorative fixture.

They'll fix your crumbling world, whether you asked them to or not.

Reality Scraps · Source Material

The creature is fiction. These are the real, verifiable facts it was synthesized from, with the exact public records used.

research · REALITY SCRAP

Building coral reef resilience through assisted evolution — Peer-reviewed work (2015) “Building coral reef resilience through assisted evolution”. published in Proceedings of the National Academy of Sciences. Abstract excerpt: The genetic enhancement of wild animals and plants for characteristics that benefit human populations has been practiced for thousands of years, resulting in impressive improvements in commercially valuable species. Despite these…

Source: OpenAlex (record WW2096973757) original record ↗

geology · REALITY SCRAP

M 5.7 - 180 km NW of Hihifo, Tonga — A magnitude 5.7 earthquake struck 180 km NW of Hihifo, Tonga on 2026-09-23, at 10.0 km depth.

Source: USGS Earthquake Catalog original record ↗

biology · REALITY SCRAP

Sagitta elegans Verrill, 1873 — GBIF holds a georeferenced occurrence of Sagitta elegans Verrill, 1873 from Svalbard and Jan Mayen in 2023, at 180.0 m depth (record 6160617386).

Source: GBIF Occurrence Records original record ↗