Wasteland Bestiary

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

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WLS-0018 · CANON RECORD

Thermo-Symbiont Worm

Fauna — Parasitic Symbiote

“A heat-seeking parasite that thrives in volcanic streams”

Generated portrait of Thermo-Symbiont Worm: Fauna — Parasitic Symbiote
3threat
6vitality
2armor
4speed
7cunning
UNCOMMON Pre-Fall bioengineering, because humanity just had to make a parasite that enjoys hot tubs, blending worm and microbe into something that treats extreme heat like a gentle sunbeam.

Special Ability

◈ Thermal Symbiosis

It worms its way into a host, sharing its laughable heat tolerance and mooching nutrients while pretending to help by slightly regulating internal temperature—a truly one-sided relationship.

HabitatIt loiters in warm, mineral-rich streams near volcanic activity, preferably where the water temperature could poach a small mammal, nesting in sediment like a lazy squatter waiting for the heat to turn up.
DietParasitic—it sips the bodily fluids of anything warm-blooded foolish enough to dip a toe into its personal hot spring, treating hosts like all-you-can-drink buffets.
BehaviorIt uses temperature gradients to hunt like a heat-seeking missile with poor impulse control, dozing off when things cool down and springing back to life the moment the sauna is back on.

Field Notes

Observe this slender, segmented charlatan lounging in near-boiling streams, masquerading as harmless debris until it sinks its microscopic hooks into your ankle. Its body is sheathed in a biofilm so resilient it treats volcanic runoff like a spa day, and it even glows faintly—nature’s way of saying 'come closer, dinner is served.'

Its lifecycle is a masterclass in freeloading: larvae hitch rides on currents like tiny, aquatic hobos, settling wherever the water is warm enough to boil an egg. Adults hop between hosts with the shamelessness of a door-to-door salesman, perfectly adapted to thrive both in scalding vents and your inconveniently warm bloodstream.

Nature’s worst roommate, and it never pays rent.

Reality Scraps · Source Material

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

hydrology · REALITY SCRAP

Kenduskeag Stream Near Bangor, Maine — The USGS stream gage Kenduskeag Stream near Bangor, Maine (site 01037000) reported a discharge of 5.2 cubic feet per second on 2026-10-06.

Source: USGS National Water Information System original record ↗

research · REALITY SCRAP

Adaptation to temperature stress by Vibrio fischeri facilitates this microbe's symbiosis with the Hawaiian bobtail squid ( Euprymna scolopes ) — Peer-reviewed work (2019) “Adaptation to temperature stress by Vibrio fischeri facilitates this microbe's symbiosis with the Hawaiian bobtail squid ( Euprymna scolopes )”. published in Evolution. Abstract excerpt: For microorganisms cycling between free-living and host-associated stages, where reproduction occurs in both of these lifestyles, an interesting inquiry is whether adaptation to stress…

Source: OpenAlex (record WW2967626425) original record ↗

geology · REALITY SCRAP

Gareloi volcano — USGS Alaska Volcano Observatory lists Gareloi at alert level ADVISORY as of 2026-10-05, (aviation color code YELLOW).

Source: USGS Volcano Notification System original record ↗

biology · REALITY SCRAP

Hymenolepis diminuta (Rudolphi, 1819) — GBIF holds a georeferenced occurrence of Hymenolepis diminuta (Rudolphi, 1819) from Costa Rica in 2025 (record 5932380190).

Source: GBIF Occurrence Records original record ↗