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Giant Amoeba

Creature 1 — amphibious, mindless, ooze

These blobs of nearly transparent protoplasm are identical in form and behavior to the microscopic creatures from which they have evolved, except their outlandish size makes them all the more dangerous. Unlike slimes, puddings, and other deadly oozes, giant amoebas have an outer membrane that contains their internal structures, making them more susceptible to slashing weapons than their amorphous kin. However, this membrane is also extremely flexible and permeable, allowing them to surround prey

Source: pathfinder-monster-core-2

Perception +4
Skills athletics +6, stealth +3
Str
+3
Dex
-2
Con
+2
Int
-5
Wis
+0
Cha
-5
AC 8 Fort +7 Ref +3 Will +5
HP 45
Immunities acid, critical-hits, precision, unconscious, visual
Weaknesses slashing 5
Speed 10 feet, climb 10 feet, swim 10 feet

Offense

Melee Pseudopod +8, Damage 1d6 acid

Abilities

Motion Sense — A giant amoeba can sense nearby creatures through vibration and air or water movement.
Constrict — 1d4 bludgeoning plus 1d4 acid{1d4 bludgeoning plus 1d4 acid}, DC 17 Fortitude Constrict
Envelop
Weak Acid — A giant amoeba's acid damages only organic material-not metal, stone, or other inorganic substances.
Grab — Grab

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