Swarm · 1 hex · SM +0 Spider Swarm [Monsters on Automatic, SRD coverage: swarms; answers Spider Swarm (SRD 3.5)]
An egg sac breaks and the ceiling comes down in pieces, and the pieces are moving. Individually harmless, in these numbers a spider swarm gets inside armour, inside sleeves, and inside the neck of a cloak, and there is nowhere to hit it that does any good.
Attributes
ST3
DX13
IQ2
HT10
HP3
Will8
Per9
FP10
Basic Speed5.75
Basic Move5
Dodge8
DR0
Melee attacks
| Usage | Level | Damage | Reach |
|---|---|---|---|
| Swarming BitesSwarming Bites: 1d-4 impaling, Reach C. No attack roll and no defence. Roll HT against the combined venom of several hundred bites or take fever and a shaking hand for the rest of the day. | no roll | 1d-4 impaling | C |
Traits (11)
- Bestial
- Cannot Speak
- Clinging
- Cold-Blooded
- Extra Legs (Eight Legs)
- Fangs
- Injury Tolerance (Diffuse)
- Night Vision 5
- No Fine Manipulators
- Restricted Diet (Carnivore)
- Vibration Sense (Air)
Notes
- GCS ancestry draft: gcs/spider-swarm.gct
- Independent build total: -19 points of racial traits plus 0 points of racial skills.
- Answers the SRD heading(s): Spider Swarm (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: 2 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). 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.
- One hex of swarm, which is where the Size Modifier comes from.
- Clinging matters here: this swarm arrives from above, and the ceiling is where it was waiting.
Encounter rating
CER7
Offense16
Protection-9
Threat tierminor
Appearing1
Wandering4
Tags
- monsters-on-automatic
- ai-generated
- doa-authored
- srd-3-5
- swarm
- animal
- vermin
- underground
- venomous
- ambusher
GCS v5 downloads
Where this one came from
- Source record
- Spider Swarm [Monsters on Automatic, SRD coverage: swarms]
- 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): Spider Swarm (SRD 3.5).
- Racial template: -19 points across 16 traits, plus 0 racial skill(s) worth 0 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.