Giant Crab - Dungeons on Automatic Bestiary

Animal · 1 hex · SM +0 Giant Crab [Monsters on Automatic, SRD coverage: mundane birds, fish and aquatic animals; answers Giant Crab (SRD 5.1)]

A crab the size of a war shield, sidling out of the surf on legs that clatter on stone. The shell shrugs off a sword cut and the claws close hard enough to take a hand off at the wrist. It is slow, stupid and almost impossible to hurt from the front.

Attributes

ST15

DX11

IQ3

HT12

HP15

Will8

Per9

FP12

Basic Speed5.75

Basic Move5

Dodge8

DR5

Melee attacks

Usage	Level	Damage	Reach
PincerPincer (12): 1d cutting, Reach C. Takes hold and does not open again while the crab lives. Cannot parry.	12	1d cutting	C

Traits (10)

Amphibious
Bestial
Cannot Speak
Cold-Blooded
Damage Resistance 5
Extra Legs (Eight Legs)
Horizontal
No Fine Manipulators
Pressure Support 1
Sharp Claws (Pincers)

Skills (2)

12Brawling
12Stealth

Notes

GCS ancestry draft: gcs/giant-crab.gct
Independent build total: -33 points of racial traits plus 6 points of racial skills.
Answers the SRD heading(s): Giant Crab (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: 120 kg. ST, Size Modifier and DR are checked against it; see the gurps-animal-sanity-check skill for the bands.
Movement: ground Move 5 (primary); water Move 5. 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.
About two metres across the leg span, which is the SM 0 row.
ST raised from an earlier draft: Basic Lift has to cover dragging a body back to the water, which is the thing the creature is for.
DR is full armour: a carapace is shell, not hide.

Encounter rating

CER18

Offense8

Protection10

Threat tierminor

Appearing2

Wandering4

GCS v5 downloads

Where this one came from

Source record: Giant Crab [Monsters on Automatic, SRD coverage: mundane birds, fish and aquatic animals]
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): Giant Crab (SRD 5.1).
Racial template: -33 points across 16 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.