Actions/Abilities/Traits: (OSE)
Action
touch
1 * touch (2d4 + paralysis)
Special
Surprise
On a roll of 1-4, due to near-invisibility.
Special
Paralysis
For 2d4 turns (save versus paralysis).
Special
Energy immunity
Unharmed by cold or lightning.
Special
Embedded items
Indigestible items (e.g. gems, coins) are carried around inside the cube.
Actions/Abilities/Traits: (Pathfinder 2e)
Ability
Engulf
DC 19, 2d6 acid, Escape DC 19, Rupture 7. A creature Engulfed by the gelatinous cube must also attempt a saving throw against paralysis.
Ability
Motion Sense
A gelatinous cube can sense nearby motion through vibration and air movement.
Ability
Paralysis
(incapacitation) A creature Engulfed by the cube or hit by its attack is paralyzed unless it succeeds at a DC 20 Fortitude save. A victim can attempt a new save to recover at the end of each of its turns.
Ability
Transparent
A gelatinous cube is so clear that it's difficult to spot. A successful DC 23 Perception check is required to notice a stationary cube, and a creature must be Searching to attempt this check. A creature that walks into the cube is automatically Engulfed (this usually causes the GM to call for initiative).
Ability
Weak Acid
A gelatinous cube's acid damages only organic material—not metal, stone, or other inorganic substances.
Offense
Melee
Circumstance: combat round (melee)
cube face +11 [+6/+1], Damage 1d6 acid plus paralysis
Trait
Mindless
A mindless creature has either programmed or rudimentary mental attributes. Most, if not all, of their mental ability modifiers are -5. They are immune to all mental effects.
Trait
Ooze
Oozes are creatures with simple anatomies. They tend to have low mental ability scores and immunity to mental effects and precision damage.
Immunity
acid
critical hits
mental
precision
unconscious
visual
Perception
motion sense 60 feet
no vision
Resistance
electricity 5