Monsters

Ooze: Immune to mind-influencing effects, poison, sleep, paralysis, stunning, and polymorphing. Not subject to critical hits.

Blindsight (Ex): An ooze's entire body is a primitive sensory organ that can ascertain prey by scent and vibration within 60 feet.

Engulf (Ex): Although it moves slowly, a gelatinous cube can simply mow down Large or smaller creatures as a standard action. It cannot make a slam attack during a round in which it engulfs. The gelatinous cube merely has to move over the opponents, affecting as many as it can cover. Opponents can make opportunity attacks against the cube, but if they do so they are not entitled to a saving throw. Those who do not attempt opportunity attacks must succeed at a Reflex save (DC 13) or be engulfed; on a success, they are pushed back or aside (opponent's choice) as the cube moves forward. Engulfed creatures are subject to the cube's paralysis and acid, and are considered to be grappled and trapped within its body.

Paralysis (Ex): Gelatinous cubes secrete an anesthetizing slime. A target hit by a cube's melee or engulf attack must succeed at a Fortitude save (DC 16) or be paralyzed for 3d6 rounds. The cube can automatically engulf a paralyzed opponent.

Acid (Ex): A gelatinous cube's acid does not harm metal or stone.

Transparent (Ex): Gelatinous cubes are hard to see, even under ideal conditions, and it takes a successful Spot check (DC 15) to notice one. Creatures who fail to notice a cube and walk into it are automatically engulfed.