Ooze · 25 hexes · SM +4 Gelatinous Cube [Monster Manual, page 201]
Attributes
ST50
DX8
IQ0
HT12
HP147
Will0
Per10
FP12
Basic Speed1
Basic Move1
Dodge4
DR—
Melee attacks
| Usage | Level | Damage | Reach |
|---|---|---|---|
| Engulf (Binding ST 30)No attack roll is necessary; the quarry may defend only by dodging and retreating. Moving through an SM+1 or smaller creature is an automatic slam. A victim who fails to dodge is pinned if smaller than the cube, or partly stuck and grappled if equal or larger. Breaking free is a Quick Contest of ST (only every 10 seconds if pinned; on a 17 or 18 the victim cannot escape unaided); the cube has +10 ST when pinning and +5 when grappling. Engulfed victims cannot breathe and begin to suffocate when out of breath. It may constrict an engulfed victim every turn at effective ST 30. | no roll | Constriction Attack, effective ST 30 (thrust 3d crushing) | C |
| Acid (Corrosion Aura)Always on, no attack roll. Any organic creature or object touching the cube takes 1d-1 corrosion per second; stone and metal are unaffected, which is why cubes carry undigested treasure. Engulfed creatures and objects take it as large-area injury. Selective. | no roll | 1d-1 corrosion per second | C |
| Paralysis (Affliction 1, HT)Contact agent, always on, no attack roll. Bare skin touching the cube must roll against HT or be paralysed for 3 seconds per point of margin of failure, then stunned with a HT roll once per second to recover. Underwater the slime is diluted and victims resist at +3. | no roll | — | C |
Traits (17)
- Blindness
- Doesn’t Breathe
- Doesn't Eat or Drink (Water Only)
- Doesn’t Sleep
- Early Maturation 5
- Hidebound
- High Pain Threshold
- Immunity to Metabolic Hazards
- Injury Tolerance (Homogenous, No Blood, No Eyes, No Head, No Neck)
- Invertebrate
- Invisibility (Affects Machines; Fringe)
- Mute
- No Legs (Slithers)
- No Manipulators
- Reduced Consumption 4 (Food Only)
- Slippery 5
- Universal Digestion
Notes
- GCS ancestry draft: gcs/gelatinous-cube.gct
- Source template total: 286 points.
- Library-rebuilt template total: 286 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 25 hexes; Weight 50,000 lbs.
Encounter rating
CER176
Offense53
Protection123
Threat tiersevere
Appearing1
Wandering1
Tags
- srd-3-5
- srd-5-1
- ooze
GCS v5 downloads
Where this one came from
- Source record
- Gelatinous Cube [Monster Manual, page 201]
- 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/gelatinous-cube.gct
- Source template total: 286 points.
- Library-rebuilt template total: 286 points.
- CER was computed from parsed Typical Stats using the Dungeons On Automatic baseline CER path.
- Issue #5: the automatic engulf (Binding 30, constriction at effective ST 30), the always-on corrosion aura and the contact paralysis affliction were added from the source's stated mechanics. Paralysis is a save-or-disable effect the baseline CER path does not price; see the encounter note on this record.
- CER recomputed from the reviewed Typical Stats through the canonical Dungeons on Automatic CER path: OR 53, PR 123, CER 176, threat tier severe.
- Conversion baseline reported OR -3, PR 123, CER 120 (tier severe). 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 1. 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-b3-cer-tails); GCS fidelity check passed, DOA playability check passed.
- CER tail record. The rating was recomputed through the consumer CER path and the tail was read against package peers in review/reports/cer-audit.md; a floor of 1 reflects a genuinely feeble creature and a severe rating tracks the record's own HP, DR and damage.
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.