I've been binging the X-Files on Netflix and, correct me if I'm wrong, but nobody gave Pathfinder stats to the black oil!
Thanks to Doctor Necrotic, whose D&D 5e eldritch ooze I used as a stepping-off point.
Black Oil (CR 9)
XP 6,400
LE Medium ooze
Init +8; Senses blindsight 60 ft.; Perception +15
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DEFENSE
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AC 23, touch 15, flat-footed 18 (+4 Dex, +1 dodge, +8 natural)
hp 119 (14d8+56)
Fort +10, Ref +10, Will +5
Defensive Abilities split (piercing & slashing, 10 hp); DR 10/—; Immune acid, mind-affecting effects, ooze traits; Resist fire 20
Weaknesses cold lethargy, curative magic susceptibility
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OFFENSE
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Speed 20 ft., climb 20 ft., swim 20 ft.
Melee slam +15 (2d10+4/19–20 plus grab)
Space 5 ft.; Reach 10 ft.
Special Attacks constrict (2d10+4), gestate, infest
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STATISTICS
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Str 17, Dex 19, Con 18, Int 16, Wis 13, Cha 8
Base Atk +10; CMB +13 (+17 grapple); CMD 27 (cannot be tripped)
Feats Deceptive, Great Fortitude, Improved Critical (slam), Improved Initiative, Lightning Reflexes, Weapon Finesse, Weapon Focus (slam)
Skills Bluff +17, Climb +11, Disguise +17, Perception +15, Sense Motive +15, Stealth +18, Swim +11
Languages Aklo, Common; cannot speak
SQ liquid form, no breath
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ECOLOGY
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Environment any temperate or warm
Organization solitary
Treasure none
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SPECIAL ABILITIES
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Cold Lethargy (Ex) Black oil is staggered for 1d3 rounds whenever it takes cold damage. Black oil becomes inactive and cannot take any action while in temperatures below 32OF.
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Curative Magic Susceptibility (Ex) Any spell that cures disease (such as remove disease) deals 1d6 points of damage per caster level (Fortitude negates) when cast directly on black oil. When cast on a creature infested by black oil, such spells force the black oil out of its oil.
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Gestate (Ex) Infest—contact; save Fort DC 21; onset 1 month; frequency 1/day; effect 1d6 Con; cure —. An afflicted Medium humanoid reduced to Constitution 0 by this ability immediately dies as a gray (Bestiary 5) bursts out. This destroys the black oil. This is an infestation effect. A remove disease (or similar effect) instantly halts this ability as it forces black oil out of the victim, but immunity to disease offers no protection, as the infestation itself is caused by the presence of the parasitic black oil. The save DC is Constitution-based.
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Infest (Ex) As a full-round action, black oil can forcefully enter the body of a living creature it grapples (Fortitude DC 21 negates). It automatically takes control of the victim’s body. This functions as the spell possession, although it is an extraordinary effect (not a necromancy spell) and the duration is indefinite. The victim can attempt a new saving throw each day to expel the black oil. The save DC is Constitution-based.
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Liquid Form (Ex) Due to its liquid composition, black oil can pass through small holes or narrow openings, even mere cracks, despite its size.