Pseudopod Punch (9) 1d-2 cr, Reach C. Always takes a random hit location.
Paralyzing, Corrosive Slime (aura) The cube is covered in slime which does 1d corrosive damage to anything it touches, with the exception of stone and metal. Any living thing touching this slime must make a HT-5 roll (add DR) or be afflicted with Paralysis for a number of minutes equal to the margin of failure, and Stunned after that, until it can make a HT roll (one roll per second).
Engulfing: When it encounters paralyzed creatures, the cube will pick them up and engulf them, adding them to its internal Payload. A cube of this size can carry up to 600 lbs at one time. Anything inside the cube will continue to be affected by the Paralysis effect of the cube’s slime, and will begin to suffocate, but will only take corrosive damage at a rate of 1 point per 10 minutes.
Bestial; Chameleon 7; Doesn’t Breathe; Doesn’t Sleep; Hidebound; High Pain Threshold; Immunity to All Mind Control; Immunity to Metabolic Hazards; Injury Tolerance (Homogenous); Invertebrate; Lifting ST 13; Mute; No Legs (Slithers); No Manipulators; Payload 60 225; Vibration Sense.
Another classic monster. I’m counting the Chameleon bonus (+14 to Stealth when motionless, or +7 when moving) as a penalty to Vision checks. Counting the +10 “in plain sight” modifier and its Size, this means a delver needs to make a Vision roll at -1, plus any darkness penalty, to notice a motionless gelatinous cube at arm’s reach.