Animal · 2 hexes · SM +1 Giant Spider [Monsters on Automatic, SRD coverage: vermin and monstrous arthropods; answers Giant Spider (SRD 5.1); Monstrous Spider (SRD 3.5)]
A body the size of a large dog on a three-metre span of legs, sitting motionless at the edge of its web where the light does not reach. It reads the whole web as one sense. What it wants is for you to be held still, and it has already arranged most of that before anybody looks up.
Attributes
ST16
DX13
IQ2
HT12
HP16
Will8
Per10
FP12
Basic Speed6.25
Basic Move6
Dodge9
DR2
Melee attacks
| Usage | Level | Damage | Reach |
|---|---|---|---|
| BiteBite (15): 1d impaling, Reach C. Delivered to something already wrapped. Roll HT or go slack — the venom is meant to stop prey struggling, not to kill it outright. | 15 | 1d impaling | C |
| WebWeb: Reach 5. Thrown as a sheet from ambush. No damage; the target is stuck fast and must win a Quick Contest against the web's ST to tear free, and everything the spider does afterwards is against a target that cannot move. The web itself has DR 3 and can be cut or burned free; fire clears a hex of it in a turn and is by far the fastest answer. | — | — | 5 |
Traits (16)
- Bestial
- Cannot Speak
- Clinging
- Cold-Blooded
- Damage Resistance 2
- Extra Legs (Eight Legs)
- Fangs
- Horizontal
- Injury Tolerance (No Brain)
- Injury Tolerance (No Neck)
- Injury Tolerance (No Vitals)
- Night Vision 5
- No Fine Manipulators
- Peripheral Vision
- Restricted Diet (Carnivore)
- Vibration Sense (Air)
Skills (2)
- 15Brawling
- 15Stealth
Notes
- GCS ancestry draft: gcs/giant-spider.gct
- Independent build total: 8 points of racial traits plus 12 points of racial skills.
- Answers the SRD heading(s): Giant Spider (SRD 5.1); Monstrous Spider (SRD 3.5). 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: 100 kg. ST, Size Modifier and DR are checked against it; see the gurps-animal-sanity-check skill for the bands.
- Movement: ground Move 6 (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.
- Three metres across the leg span, which is the SM +1 row; the body is nearer a metre.
- ST from Basic Lift: it hauls a wrapped human up a web line.
- The web is priced by its binding ST rather than by damage, which is how the rating path sees an ability that does no injury at all.
- The 3.5 'Monstrous Spider' heading is a size family, not a distinct creature. It is dispositioned onto this record; its other sizes belong to the variant batch, not here.
- Added after a post-hoc comparison against independent GURPS fan conversions of this creature: Peripheral Vision. The comparison surfaced the gap; the build is still ours.
- Web durability and flammability added after a post-hoc comparison against independent GURPS fan conversions, which all state them and this build did not. A binding a party cannot attack is a different creature from one they can burn.
Encounter rating
CER40
Offense30
Protection10
Threat tierstandard
Appearing2
Wandering4
Tags
- monsters-on-automatic
- ai-generated
- doa-authored
- srd-5-1
- srd-3-5
- animal
- arthropod
- vermin
- underground
- forest
- venomous
- ambusher
- wandering-encounter
GCS v5 downloads
Where this one came from
- Source record
- Giant Spider [Monsters on Automatic, SRD coverage: vermin and monstrous arthropods]
- 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 Spider (SRD 5.1); Monstrous Spider (SRD 3.5).
- Racial template: 8 points across 22 traits, plus 2 racial skill(s) worth 12 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.