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, allowing it to fight as well as if it could see. However, a sewer ooze can't see, so effects that depend on vision or seeing don't work on it.

AC  8; Fort +9, Ref +1, Will +3

HP 40; Immunities acid, critical hits, mental, sneak attack, unconscious

Speed 10 feet

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

Filth Wave [>] The sewer ooze unleashes a wave of filth, covering all creatures within 20 feet of itself. Each creature in the area must succeed at a DC 17 Reflex save or take 1d4 acid damage and a –10-foot penalty to its Speeds for 1 minute (on a critical failure, the creature also falls over and gains the prone condition). A creature can Interact to clean someone off. This decreases the Speed penalty to –5 feet after 1 action, or to no penalty after 2 actions. After using Filth Wave, the ooze can't use it again for 1 minute.

Beginner Box, page 72. Reprinted in TiO.