Aberration · 2 hexes · SM +0 Gibbering Mouther [Monster Manual, page 126]
Attributes
ST15
DX10
IQ6
HT13
HP15
Will10
Per10
FP13
Basic Speed5.75
Basic Move3
Dodge8
DR2
Melee attacks
| Usage | Level | Damage | Reach |
|---|---|---|---|
| Sharp TeethSharp Teeth (12): thrust 1d+1 cutting (KYOS: 2d cutting), Reach C. | 12 | thrust 1d+1 cutting (KYOS: 2d cutting) | C |
| Spit AcidSpit Acid (12): 1d-1 corrosion. Ranged attack (Acc 3, Range 10), costs 1 FP. | 12 | 1d-1 corrosion. Ranged attack (Acc 3, Range 10), costs 1 FP | — |
| GibberingAs soon as a mouther spots something edible, it begins a constant gibbering. When a creature hears this gibbering, it must roll a Fright Check using the Confusion table (GURPS Powers, p. 85). If a victim succeeds at his Fright Check, he will be unaffected by this ability for one hour. | — | — | — |
| Ground ManipulationA gibbering mouther can cause stone and earth in a 4-yard radius around it to become a morass akin to quicksand. This requires a Concentrate maneuver and costs 1 FP. Mired creatures are grappled with ST 12. Their only way to free themselves is to break free with a successful Quick Contest of ST. Softening stone requires two consecutive Concentrate maneuvers. This effect persists for 10 seconds. | — | — | 4 yards |
| SpittleCorrosion Attack 1d-1 (Blockable, -5%; Costs Fatigue, 1 FP, -5%; Increased 1/2D, x10, +15%; One-Shot, -10%; Reduced Range, 1/10, -30%) Resolve as stated by the construction; the source gives no separate resolution text. | — | 1d-1 corrosion | — |
Traits (15)
- 360° Vision
- Appearance (Monstrous; Universal)
- Constriciton Attack
- Disturbing Voice
- Extra Attack 5
- Extra Mouth 5
- Horizontal
- Immunity to Ground Manipulation
- Infravision
- Injury Tolerance (Damage Reduction 2; Limited, Crushing)
- Injury Tolerance (Homogenous, No Blood, No Eyes, No Head, No Neck)
- Invertebrate
- No Legs (Slithers)
- No Manipulators
- Social Stigma (Monster)
Skills (2)
- 12Brawling
- 12Innate Attack (Breath)
Notes
- GCS ancestry draft: gcs/gibbering-mouther.gct
- Source template total: 295 points.
- Library-rebuilt template total: 295 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
CER31
Offense21
Protection10
Threat tierstandard
Appearing1
Wandering3
Tags
- srd-3-5
- srd-5-1
- aberration
GCS v5 downloads
Where this one came from
- Source record
- Gibbering Mouther [Monster Manual, page 126]
- 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/gibbering-mouther.gct
- Source template total: 295 points.
- Library-rebuilt template total: 295 points.
- CER was computed from parsed Typical Stats using the Dungeons On Automatic baseline CER path.
- Issue #5: 3 special ability construction(s) restored (Gibbering, Ground Manipulation, Spittle). 2 save-or-disable construction(s) are scored through the affliction term at the source's stated point cost, or at Binding ST where the source builds the ability as a Binding.
- CER recomputed from the reviewed Typical Stats through the canonical Dungeons on Automatic CER path: OR 21, PR 10, CER 31, threat tier standard.
- Conversion baseline reported OR 10, PR 10, CER 20 (tier minor). 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-b4-special-mechanics); GCS fidelity check passed, DOA playability check passed.
- Special-mechanics record. Mechanics the CER path cannot price are named per record in review/reports/cer-audit.md rather than folded into the number, and encounter counts are capped where a save-or-disable attack is present.
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.