A creature I submitted for the Netbook of Psionics. 
Ethereal Slime
Huge Ooze (Incorporeal, Psionic)
Hit Dice: 8d10+16 (60 hp)
Initiative: -5
Speed: Fly 20 ft. (perfect) (4 squares)
Armor Class: 4 (-2 size, -5 Dex, +1 deflection), touch 4, flat-footed 4
Base Attack/Grapple: +6/--
Attack: Incorporeal touch -1 melee (1d6 Int plus 2d6 Psi Points)
Full Attack: Incorporeal touch -1 melee (1d6 Int plus 2d6 Psi Points)
Space/Reach: 15 ft./10 ft.
Special Attacks: Mind drain
Special Qualities: Blindsight 60 ft., power resistance 18, transparent, incorporeal traits, ooze traits
Saves: Fort +4, Ref -3, Will -3
Abilities: Str --, Dex 1, Con 15, Int --, Wis 1, Cha 1
Skills: --
Feats: --
Environment: Ethereal Plane
Organization: Solitary
Challenge Rating: 6
Treasure: None
Alignment: Always neutral
Advancement: 9-17 HD (Huge); 18-25 HD (Gargantuan)
Level Adjustment: --
A barely discernable silvery-blue cloud hovers in the air, advancing silently by projecting roiling blobs then flowing forward to occupy the space. It has no discernable features other than small, sparkling nodules located throughout its form.
An ethereal slime is native to the ethereal plane, and it lives off the psychic energies emitted by living organisms. It is particularly attracted to beings with strong psionic energies, and will tirelessly follow such creatures until it can consume and extinguish their source of power. This life form is completely mindless and functions entirely at an instinctual level.
Combat
An ethereal slime will move toward the strongest source of living or psionic energy nearby, and will seek to drain this food source by occupying the ethereal space with its body.
Mind Drain (Su): The touch of an ethereal slime deals 1d6 points of Intelligence damage to a living foe. A creature reduced to Intelligence 0 by an ethereal slime dies. This is a psionic effect.
A psionic creature touched by an ethereal slime must also succeed on a DC 16 Will save or be drained of 2d6 power points. Every 2 power points drained will heal a point of damage to the ethereal slime. The save DC is Constitution-based.
Blindsight (Ex): An ethereal slime can sense the presence and location of living beings nearby, and can detect the location and strength of psionic auras. Non-living creatures such as undead and constructs gain the benefit of concealment against an ethereal slime.
Transparent (Ex): An ethereal slime is hard to see from outside the ethereal plane, even under ideal conditions, and it takes a DC 15 Spot check to notice one. Creatures that fail to notice an ethereal slime and walk into it are automatically hit for mind drain.
Ethereal Slime
Huge Ooze (Incorporeal, Psionic)
Hit Dice: 8d10+16 (60 hp)
Initiative: -5
Speed: Fly 20 ft. (perfect) (4 squares)
Armor Class: 4 (-2 size, -5 Dex, +1 deflection), touch 4, flat-footed 4
Base Attack/Grapple: +6/--
Attack: Incorporeal touch -1 melee (1d6 Int plus 2d6 Psi Points)
Full Attack: Incorporeal touch -1 melee (1d6 Int plus 2d6 Psi Points)
Space/Reach: 15 ft./10 ft.
Special Attacks: Mind drain
Special Qualities: Blindsight 60 ft., power resistance 18, transparent, incorporeal traits, ooze traits
Saves: Fort +4, Ref -3, Will -3
Abilities: Str --, Dex 1, Con 15, Int --, Wis 1, Cha 1
Skills: --
Feats: --
Environment: Ethereal Plane
Organization: Solitary
Challenge Rating: 6
Treasure: None
Alignment: Always neutral
Advancement: 9-17 HD (Huge); 18-25 HD (Gargantuan)
Level Adjustment: --
A barely discernable silvery-blue cloud hovers in the air, advancing silently by projecting roiling blobs then flowing forward to occupy the space. It has no discernable features other than small, sparkling nodules located throughout its form.
An ethereal slime is native to the ethereal plane, and it lives off the psychic energies emitted by living organisms. It is particularly attracted to beings with strong psionic energies, and will tirelessly follow such creatures until it can consume and extinguish their source of power. This life form is completely mindless and functions entirely at an instinctual level.
Combat
An ethereal slime will move toward the strongest source of living or psionic energy nearby, and will seek to drain this food source by occupying the ethereal space with its body.
Mind Drain (Su): The touch of an ethereal slime deals 1d6 points of Intelligence damage to a living foe. A creature reduced to Intelligence 0 by an ethereal slime dies. This is a psionic effect.
A psionic creature touched by an ethereal slime must also succeed on a DC 16 Will save or be drained of 2d6 power points. Every 2 power points drained will heal a point of damage to the ethereal slime. The save DC is Constitution-based.
Blindsight (Ex): An ethereal slime can sense the presence and location of living beings nearby, and can detect the location and strength of psionic auras. Non-living creatures such as undead and constructs gain the benefit of concealment against an ethereal slime.
Transparent (Ex): An ethereal slime is hard to see from outside the ethereal plane, even under ideal conditions, and it takes a DC 15 Spot check to notice one. Creatures that fail to notice an ethereal slime and walk into it are automatically hit for mind drain.
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