Living prison · Physical
A corridor can look remarkably empty while containing a great deal of trouble. The Cube rewards a careful second look.
Reference statistics
Basic difficulty · ordinary profile before temporary states and encounter adjustments
- HP
- 86
- Armor class
- 9
- Attack
- +3
- Damage
- d6+1
- Initiative
- 3
- Strikes
- 1
Weaknesses Frost
Resistances Earth
Polymorph immunity Yes
Traits and special behavior
Engulf. On its first available turn, the Cube captures one free living hero without dealing initial damage. While that captive lives, digestion consumes its whole action and deals 2 + one-quarter of the tier damage bonus, rounded down, as untyped direct damage. It can recapture no earlier than two rounds after the previous capture; otherwise it makes an ordinary strike.
Escape. The captive spends their turn to roll d20 plus one-quarter of Attack, rounded down with a minimum bonus of zero, against 12. Natural 1 and 20 have no special override. Other captive actions and Flee are disabled; allies may still heal or flee. The Cube’s death, combat exit or a successful party flee releases the captive. The Cube is immune to Polymorph.
See the condition reference for the shared effects, and enemy tuning for difficulty-wide chance adjustments.
Statistics by difficulty
| Difficulty | HP | AC | Attack | Damage | Strikes |
|---|---|---|---|---|---|
| Basic | 86 | 9 | +3 | d6+1 | 1 |
| Advanced | 190 | 14 | +7 | d6+5 | 1 |
| Expert | 238 | 20 | +10 | d6+9 | 1 |
| Master | 324 | 22 | +12 | d6+11 | 1 |
| Master+ | 432 | 24 | +13 | d6+15 | 1 |
Includes explicit tier overrides and the final maximum-HP multiplier. Damage is the ordinary die and bonus, before final outgoing multipliers. Rage, growth, buffs, encounter adjustments and special action damage are not baked into this table.
Current appearances
| Adventure | Location | Encounter roster |
|---|---|---|
| The Lost Dungeons | The Fallen Prison | Gelatinous Cube × 1 |
Detailed reference
These panels retain the exact authored configuration, including unscaled base values. For tier overrides, −1 Attack or damage bonus and zero HP or strikes mean “inherit”; tier indices run from 0 (Basic) to 4 (Master+). Field values and message templates are shown as reference data, not additional rules.
Creature configuration
- Stable identifier
- gelatinousCube
- Name
- Gelatinous Cube
- Plate Name
- Cube
- Role
- Living prison
- HP
- 86
- Armor class
- 9
- Attack
- 3
- Damage die
- 6
- Damage bonus
- 1
- Initiative
- 3
- Artwork registry index
- 30
- Visual Scale
- 1.48
- Preserve Aspect
- Yes
- Element
- Attack Text
- {actor} lashes out at {target}.
- Ability
- engulf
- Immune to Polymorph
- Yes
- Weaknesses
- Frost
- Resistances
- Earth
- Visual Top Padding
- 0.089314
- Visual Bottom Padding
- 0.078947
- Tier Adjustments
- Tier index (0–4)
- 2
- Attack
- -1
- Damage bonus
- -1
- HP
- 72
- Tier index (0–4)
- 3
- Attack
- -1
- Damage bonus
- -1
- HP
- 72
- Tier index (0–4)
- 4
- Attack
- -1
- Damage bonus
- -1
- HP
- 72
Encounter configurations (1)
Whole encounter rewards and modifiers are shown here; they are not rewards for defeating this creature alone. Legacy fields remain visible for configuration audits.
- Stable identifier
- fallenPrison
- Enemies
- gelatinousCube
- greenSlime
- greenSlime
- Gold
- 42
- Xp
- 46
- Opening
- The cube traps heroes: escape or kill it. Weapons splash acid; spells are safe.
Artwork and presentation
- Resource
- JournalArt/Adventures/LostDungeons/Creatures/GelatinousCube
- Registrations
- Resource
- JournalArt/Adventures/LostDungeons/Creatures/GelatinousCube
- Height Units
- 1.6
- Body Height
- 0.831738
- Ground Y
- 0.078947
- Center X
- 0.500399
Download the exact creature definition (JSON)
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