n medium mindless ooze 

Perception +8; motion sense 60 feet, no vision

Skills Athletics +11, Stealth +10 (+12 in moist environments)

Str +5 Dex +2 Con +4 Int -5 Wis +0 Cha -5

Motion Sense An amoeba swarm can sense nearby creatures through vibration and air or water movement.

Puddled Ambush [R] Trigger A creature enters a space occupied by a gray ooze; Requirements Initiative has not yet been rolled; Effect The gray ooze automatically notices the creature, then makes a pseudopod Strike against one creature adjacent to itself before rolling initiative.

AC  14; Fort +12, Ref +10, Will +8

HP 60; Immunities acid, mental, precision, critical hits, unconscious, visual

Speed 10 feet, climb 10 feet

Melee [>] pseudopod +13 (agile), Damage 1d6+5 bludgeoning plus 1d6 acid and Grab

Constrict [>] 1d6 bludgeoning plus 1d6 acid, DC 21

Gray Ooze Acid A gray ooze's acid damages only metal and organic materials, not stone.

Bestiary 2, page 194. Expanded in LOIL.