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Rust Ooze

These reddish-brown globs wriggle through sewers and other waterways in search of iron pipes, metal trash, and other objects that rust.

Recall Knowledge - Ooze (Occultism): DC 20
Unspecific Lore: DC 18
Specific Lore: DC 15

Elite | Normal | Weak
Proficiency without Level

Rust OozeCreature 3

Uncommon N Medium Mindless Ooze 
Source Pathfinder #178: Punks in a Powderkeg pg. 87
Perception +6; motion sense 60 feet, no vision
Skills Athletics +9, Stealth +5 (+7 in areas of rusty objects)
Str +4, Dex -4, Con +3, Int -5, Wis +1, Cha -5
Motion Sense A rust ooze can sense nearby creatures through vibration and air or water movement.
AC 11; Fort +10, Ref +3, Will +6
HP 80; Immunities critical hits, mental, precision, unconscious, visual; Resistances metal 5; Weaknesses electricity 5
Corrode Weapon Trigger The rust ooze is hit with a metal weapon; Effect The rust ooze deals 2d6 acid damage to the item, ignoring its Hardness.Metal Resistance A rust ooze has resistance 5 to metal weapons.
Speed 15 feet, swim 30 feet
Melee pseudopod +11 [+6/+1], Damage 1d6+5 bludgeoning plus rust and tetanusRust When a rust ooze critically succeeds at a pseudopod Strike, it deals 2d6 acid damage to a metal item the target is wearing or holding, ignoring the item's Hardness. If a creature uses the Shield Block reaction with a metal shield against a rust ooze's pseudopod attack, the shield is automatically broken, but no other item is rusted.

Sidebar - Related Creatures Rust Oozes and Rust Monsters

While no one is sure how the first rust ooze came to be, some theorize that Hubert Brunt, an ooze researcher at Blythir College, spilled some proto-ooze on a rust monster antennae a colleague was studying. The urban legend says it consumed the antennae and absorbed the rust monster's powers, then consumed all of the metal instruments in the lab before a frightened attendant hastily washed the animated muck down the drain.

All Monsters in "Ooze"

Amoeba Swarm1
Black Pudding7
Blood Ooze4
Carnivorous Blob13
Chromatic Ooze18
Crawling Slurry16
Gelatinous Cube3
Giant Amoeba1
Gray Ooze4
Ooze, Gunpowder14
Id Ooze7
Ochre Jelly5
Ooze, Pyronite10
Rust Ooze3
Sewer Ooze1
Slime Mold2
Tallow Ooze11
Vaultbreaker Ooze6
Verdurous Ooze6
Yeast Ooze2


Source Bestiary pg. 254
Slimes, molds, and other oozes can be found in dank dungeons and shadowed forests. While not necessarily evil, some grow to enormous sizes and have insatiable appetites.

Sidebar - Related Creatures Amoebas Large and Small

Giant amoebas and amoeba swarms are usually found near each other, as the two oozes are part of the same life cycle. When a giant amoeba grows large enough, it can spontaneously split apart into two separate amoeba swarms, and when an amoeba swarm feeds enough, its individual components can fuse together into a single creature.

Sidebar - Additional Lore Oozing Acid

Many oozes have acidic attacks that can quickly degrade flesh, wood, and even stronger materials. Some believe that oozes are the result of alchemical or magical experimentation run amok, while others postulate that they simply emerged from the natural processes of evolution.

Sidebar - Related Creatures Other Oozes

Many varieties of these nearly mindless predators exist in the world. Some are mere variants, with different colored puddings, jellies, and oozes with little to differentiate them from those presented here other than their habitat. Others are more specialized, or even dangerously intelligent. The shoggoth is one such example, but another variety of deadly and powerful ooze is the thankfully rare blight, a creature composed of protoplasm and eyes that curses entire regions with its presence.