n medium mindless ooze 

Perception +3; motion sense 60 feet, no vision

Skills Stealth +1 (+4 in sewers)

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

Motion Sense A sewer ooze can sense nearby motion through vibration and air movement.

AC  8; Fort +9, Ref +1, Will +3

HP 40; Immunities acid, critical hits, mental, precision, unconscious, visual

Speed 10 feet

Melee [>] pseudopod +9, Damage 1d6+1 bludgeoning plus 1d4 acid

Filth Wave [>] Frequency once per minute; Effect The sewer ooze unleashes a wave of filth, covering all creatures within a 20-foot emanation. Each creature in the area must succeed at a DC 17 Reflex save or take 1d4 acid damage and take a –10-foot penalty to its Speeds for 1 minute (on a critical failure, the creature also falls prone). A creature can spend an Interact action to clean someone off, decreasing the Speed penalty by 5 feet with each action.

Bestiary, page 254. Expanded in LOIL.