Aberration · 2 hexes · SM +0 Rust Monster [Monster Manual, page 216]
Attributes
ST10
DX13
IQ2
HT12
HP15
Will9
Per13
FP12
Basic Speed6.25
Basic Move8
Dodge8
DR3
Melee attacks
| Usage | Level | Damage | Reach |
|---|---|---|---|
| Sharp TeethSharp Teeth (13): thrust 1d-3 cutting, Reach C. | 13 | thrust 1d-3 cutting | C |
| Rusting AntennaeRusting Antennae (13): The rust monster has specialized antennae that are not armored, but provide a normal sense of touch. The antennaes allow the creature to feel things one yard away and can be targeted at -6 (comparable to eye-stalks described on p. B34). In addition, the rust monster can touch a metal object with its antenna to deal it 5d corrosion damage. It can parry with its antennaes. | 13 | The rust monster has specialized antennae that are not armored, but provide a normal sense of touch. The antennaes allow the creature to feel things one yard away and can be targeted at -6 (comparable to eye-stalks described on p. B34). In addition, the rust monster can touch a metal object with its antenna to deal it 5d corrosion damage. It can parry with its antennaes | — |
Traits (12)
- Detect Metal (Biological (Passive); Smell-Based, Reversed)
- Discriminatory Smell
- Extra Legs (Four Legs; Cannot Kick)
- Horizontal
- Infravision
- No Fine Manipulators
- Numb
- Peripheral Vision
- Reduced Consumption 3
- Restricted Diet (Rusted Metal)
- Sharp Teeth
- Wild Animal
Skills (1)
- 14Tracking
Notes
- GCS ancestry draft: gcs/rust-monster.gct
- Source template total: 15 points.
- Library-rebuilt template total: 15 points.
- CER was computed from parsed Typical Stats using the Dungeons On Automatic baseline CER path.
- Review attacks, special abilities, encounter frequency, treasure, grappling, and GCS modifiers before approval.
- Size 2 hexes; Weight 200 lbs.
Encounter rating
CER51
Offense42
Protection9
Threat tierstandard
Appearing1
Wandering3
Tags
- srd-3-5
- srd-5-1
- aberration
GCS v5 downloads
Where this one came from
- Source record
- Rust Monster [Monster Manual, page 216]
- Source system
- gurps_4e_fan_conversion / author_permission
- Released under
- cc_by_4_0
- Conversion
- 0.2.0-reviewed
- Review status
- approved
- Credit
- Original GURPS conversion by Enraged Eggplant, from Monsters (May 11, 2024); adapted and republished with permission.
- GCS ancestry draft: gcs/rust-monster.gct
- Source template total: 15 points.
- Library-rebuilt template total: 15 points.
- CER was computed from parsed Typical Stats using the Dungeons On Automatic baseline CER path.
- CER recomputed from the reviewed Typical Stats through the canonical Dungeons on Automatic CER path: OR 42, PR 9, CER 51, threat tier standard.
- Conversion baseline reported OR 43, PR 9, CER 52 (tier standard). The reviewed values come from the consumer CER implementation, which rounds damage once after the damage-type multiplier and credits ranged accuracy; the conversion baseline ceilinged the damage base first and ignored range.
- Encounter metadata derived (solitary): average number appearing 1, wandering weight 3. Encounter metadata derived for 0.2.0 from the reviewed threat tier and creature class (appearing: minor 4 / standard 2 / major 1 / severe 1, forced to 1 for solitary classes — including swarms, which are a single multi-body creature — and raised to 6 for gregarious minor creatures; wandering weight: minor 4 / standard 3 / major 2 / severe 1). The fan-conversion source states no appearing-in-numbers or wandering values, so these are derived, not source mechanics.
- Lair, treasure, and grappling remain unpopulated in 0.2.0 by package policy: the authorized fan-conversion source states no lair, treasure, or grappling values, and review declines to invent them. See review/policy/0.2.0-empty-field-policy.md.
- Review approved by automated-mechanical-review on 2026-07-26 (batch ee-2026-07-26-b5-cer-drift); GCS fidelity check passed, DOA playability check passed.
- The conversion baseline's published ratings disagreed with the consumer CER path; the reviewed ratings come from the consumer implementation and the difference is recorded in conversionNotes.
Enraged Eggplant GURPS monster conversions; used, adapted, and republished with unrestricted permission from the author. Portrait and tokens are AI-generated original art. Sources and credits.