Animal · 12 hexes · SM +5 Tyrannosaurus [Monsters on Automatic, SRD coverage: dinosaurs and prehistoric beasts; answers Tyrannosaurus Rex (SRD 5.1); Tyrannosaurus (SRD 3.5)]
Twelve metres of animal whose only real predator is another one of itself. It smells a party long before it sees them, it does not stalk, and it does not test — it walks straight in, because in its entire experience nothing has ever been worth caution. The correct response is distance and terrain, not a plan.
Attributes
Melee attacks
| Usage | Level | Damage | Reach |
|---|---|---|---|
| BiteBite (13): 5d+1 impaling, Reach C,2. Takes a whole person, or a whole horse, and does not need a second attempt. Jaws that crack bone as a matter of routine. | 13 | 5d+1 impaling | C,2 |
| TrampleTrample (11): 5d+2 crushing, Reach C. Against a target already down. | 11 | 5d+2 crushing | C |
Traits (13)
- Bestial
- Bloodlust (12)
- Cannot Speak
- Damage Resistance 4 (Tough Skin)
- Discriminatory Smell
- Enhanced Move 0.5 (Ground)
- Fangs (Bone-Cracking Teeth)
- Fearlessness 3
- High Pain Threshold
- Horizontal
- Night Vision 3
- No Fine Manipulators
- Restricted Diet (Carnivore)
Skills (2)
- 13Brawling
- 12Tracking
Notes
- GCS ancestry draft: gcs/tyrannosaurus.gct
- Independent build total: 40 points of racial traits plus 8 points of racial skills.
- Answers the SRD heading(s): Tyrannosaurus Rex (SRD 5.1); Tyrannosaurus (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: 7000 kg. ST, Size Modifier and DR are checked against it; see the gurps-animal-sanity-check skill for the bands.
- Movement: ground 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.
- Twelve metres nose to tail, which is the SM +5 row.
- ST from Basic Lift: it lifts and shakes a carcass the weight of a horse, which is the heaviest thing it demonstrably does. Tonnage would give a larger figure that no encounter could use.
- At this Size Modifier the published Strength discount for size has bottomed out, so the racial template prices ST at the floor of its cost rather than lower.
- The bite is impaling rather than cutting. A tyrannosaur's teeth are thick conical pegs built to punch through bone and hold, not serrated blades — which is what separates it from the dromaeosaurs in this batch, whose teeth genuinely are knives.
- Added after a post-hoc comparison against independent GURPS fan conversions of this creature: Night Vision; the Tracking skill, which a creature with Discriminatory Smell should always have. The comparison surfaced the gap; the build is still ours.
Encounter rating
Tags
- monsters-on-automatic
- ai-generated
- doa-authored
- srd-5-1
- srd-3-5
- animal
- reptile
- dinosaur
- predator
- prehistoric
- apex
- wandering-encounter
GCS v5 downloads
Where this one came from
- Source record
- Tyrannosaurus [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): Tyrannosaurus Rex (SRD 5.1); Tyrannosaurus (SRD 3.5).
- Racial template: 40 points across 19 traits, plus 2 racial skill(s) worth 8 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.

