unique n large mindless mutant ooze 

Perception +10; motion sense 60 feet, no vision

Skills Stealth +9 (+12 in sewers)

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

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

AC  16; Fort +16, Ref +8, Will +10

HP 45; Immunities acid, mental, precision, critical hits

Noxious Scent (aura, olfactory) 30 feet. A creature that enters the area must attempt a DC 23 Fortitude save. On a failure, the creature is sickened 1 (sickened 2 on a critical failure). A creature taking persistent acid damage from the ooze's pseudopod can't recover from the sickened condition. A creature that succeeds at its save is temporarily immune for 1 minute.

Speed 10 feet

Melee [>] pseudopod +17 (agile, deadly d10, finesse, versatile s), Damage 2d8+5 bludgeoning plus 1d4 acid and 1d4 persistent 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 24 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 prone). A creature can spend an Interact action to clean someone off, decreasing.

the Speed penalty by 5 feet with each action.

Strength of Thousands #2: Spoken on the Song Wind, page 37.