Plesiosaurus - Dungeons on Automatic Bestiary

Plesiosaurus top-down flat-top hex token

Animal · 3 hexes · SM +2 Plesiosaurus [Monsters on Automatic, SRD coverage: dinosaurs and prehistoric beasts; answers Plesiosaurus (SRD 5.1)]

Four and a half metres of barrel body rowing itself along on four flippers, with a neck that arrives before the rest of it. It hunts fish and has no strong opinion about people, right up until a boat sits between it and the shoal.

Attributes

ST24

DX12

IQ3

HT13

HP24

Will9

Per10

FP13

Basic Speed6.25

Basic Move6

Dodge9

DR2

Melee attacks

Usage	Level	Damage	Reach
BiteBite (14): 2d cutting, Reach C,2. A mouth full of interlocking needles, delivered on a neck that reaches over a gunwale.	14	2d cutting	C,2

Traits (14)

Amphibious
Bestial
Breath-Holding 3
Cannot Speak
Cold-Blooded
Damage Resistance 2 (Tough Skin)
Enhanced Move 0.5 (Water)
Horizontal
Nictitating Membrane 2
Night Vision 3
No Fine Manipulators
Pressure Support 1
Restricted Diet (Carnivore)
Sharp Teeth

Skills (2)

14Brawling
14Swimming

Notes

GCS ancestry draft: gcs/plesiosaurus.gct
Independent build total: -2 points of racial traits plus 6 points of racial skills.
Answers the SRD heading(s): Plesiosaurus (SRD 5.1). Only the creature identity is taken from the SRD; the GURPS statistics, ratings and prose are this project's own work and reproduce no SRD text.
Typical Stats, damage and ratings are derived from the racial template, not authored beside it, so the sheet and the stat block cannot disagree.
Body mass used to scale this build: 500 kg. ST, Size Modifier and DR are checked against it; see the gurps-animal-sanity-check skill for the bands.
Movement: ground Move 6; water Move 6, 9 at a sprint (primary). The published Move is the primary medium's cruising Move; sprint figures are stated here and not folded into it.
Treasure and grappling are not authored for this batch and ship as explicit nulls; `lair` carries a short habitat note, because where a wandering animal dens is an encounter fact rather than a loot one.
Four and a half metres, which is the SM +2 row.
ST from Basic Lift: it carries off a 120 kg piece of whatever it took.

Encounter rating

CER38

Offense18

Protection20

Threat tierstandard

Appearing1

Wandering3

GCS v5 downloads

Where this one came from

Source record: Plesiosaurus [Monsters on Automatic, SRD coverage: dinosaurs and prehistoric beasts]
Source system: doa_fixture / doa_authored
Released under: cc_by_4_0
Conversion: 0.1.0-srd-independent-build
Review status: approved
Credit: Monster statistics, ratings and description prose by Monsters on Automatic; AI-generated first draft, project-reviewed, released under CC BY 4.0.
Description: Written by Dungeons on Automatic, released under cc_by_4_0

Independently authored GURPS build. The SRD supplies the creature identity this record answers to and nothing else: no SRD statistics, wording or presentation is reproduced, and no third-party GURPS conversion was used as an input.
Answers the SRD heading(s): Plesiosaurus (SRD 5.1).
Racial template: -2 points across 20 traits, plus 2 racial skill(s) worth 6 points.
Every trait is drawn from the project's controlled GURPS vocabulary in scripts/srd/trait-library.mjs, which carries the page reference and published cost for each entry.
sourceSystem is recorded as doa_fixture because that is the package contract's value for project-authored material; the SRD headings this record answers are in provenance.coversSourceIdentities.
Ratings are recomputed through the consumer CER path on every build, so a mechanics change cannot leave a stale rating behind.

Copyright 2026 Monsters on Automatic. GURPS-compatible monster statistics, ratings and prose authored for this package as an AI-generated first draft under project review. No SRD text, and no third-party GURPS conversion, is reproduced. Portrait and tokens are AI-generated original art. Sources and credits.