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.

Improved Grab (Ex): To use this ability, the gray ooze must hit with its slam attack. If it gets a hold, it can constrict.

Acid (Ex): A gray ooze secretes a digestive acid that quickly dissolves organic material and metal. Any melee hit deals acid damage. The ooze's acidic touch deals 40 points of damage per round to wood or metal objects. Armor or clothing dissolves and becomes useless immediately unless it succeeds at a Reflex save (DC 19). The acid cannot harm stone. A metal or wooden weapon that strikes a gray ooze also dissolves immediately unless it succeeds at a Reflex save (DC 19).

Constrict (Ex): A gray ooze deals automatic slam and acid damage with a successful grapple check. The opponent's clothing and armor suffer a -4 penalty to Reflex saves against the acid.

Camouflage (Ex): It takes a successful Spot check (DC 15) to recognize a motionless gray ooze for what it really is.