n large mindless ooze 

Perception +7; motion sense 60 feet, no vision

Skills Athletics +13

Str +4 Dex -5 Con +6 Int -5 Wis +0 Cha -5

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

AC  12; Fort +15, Ref +4, Will +7

HP 150; Immunities acid, electricity, mental, piercing, precision, slashing, critical hits, unconscious, visual

Split Whenever an ochre jelly is hit by an attack or effect that would deal slashing, piercing, or electricity damage and the ochre jelly has at least 10 HP, the jelly splits into two identical jellies with half the original's HP. One jelly is in the same space as the original, and the other appears in an adjacent unoccupied space. If no adjacent space is unoccupied, it automatically pushes creatures and objects out of the way to fill a space (the GM decides if an object or creature is too big or sturdy to push).

Speed 15 feet, climb 10 feet

Melee [>] pseudopod +15, Damage 1d8+7 bludgeoning plus 2d4 acid and Grab

Constrict [>] 1d8+3 bludgeoning plus 1d4 acid, DC 23

Ochre Acid An ochre jelly's acid damages only flesh—not bone, stone, wood, or other materials.

Bestiary, page 255. Expanded in LOIL.