Thought Eater (GEP)

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Thought eaters are Border swimmers that sift the adjoining planes for keen minds; psionic power and intrinsic intelligence literally serve these monsters as "food for thought." Sheathed only in ethereal mist, a thought eater's body is skeletal, possessing a platypus-like head and webbed bony flippers. Against another creature upon the Border, thought eaters pose little threat, and in fact are easily dispatched. If a thought eater is brought to another plane, it quickly perishes without the surrounding ethereal medium to "flesh out" its body. An ethereal thought eater can do considerable damage to sods on an adjoining plane, however.
Thought eaters can sense psionic activity, magic, and raw intellect on an adjoining plane. Thought eaters feed on such sources, converting the resultant energy into psionic power points (PSPs), which they use at a rate of 3 PSPs per hour to maintain their ethereal state. If they run out of PSPs, they drop out of the Ethereal and perish. Note that thought eaters can feed on fellow Ethereal creatures as well, but most other Ethereal creatures can easily slay thought eaters under normal circumstances.
To material victims, thought eaters are normally invisible; thought eaters sometimes feed unnoticed and uncontested until sated, or until their victims are out of range. Although a thought eater has a movement rate of only 6, the creature's ethereal state allows it to move through physical walls, ceilings, and other barricades as if they didn't exist. (MONSTROUS MANUAL) 
THOUGHT EATER: AC {9}; MV {6}; HD 3; THAC0 Nil; #AT O; Dmg Nil; SA Drains psionics, spells, and Intelligence; SZ S (3' long); ML unsteady (5-7); Int N/A; AL N; XP 1,400. 
SA-Drain: If within 60' ofan appropriate source, thought eaters drain 10 PSPs per round; absorb any spell cast (gaining 5 PSPs/spell level); drain 1 memorized spell per round; or permanently drain 1 point of Intelligence per round (gaining 10 PSPs for each Int point absorbed), in order of preference. Thought eaters feed until all victims die or escape, or until sated (200 PSPs).
Psionics Summary-#AT 0, MTHAC0 Nil, MAC 5, Lv 3; PSPs 1 d 100+ 100; Psionic Attacks None; Psionic Defenses Intellect Fortress (IF), Thought Shield (TS); Psionic Disciplines- psionic sense (a metapsionic power that allows thought eaters to scan another plane from its Border for appropriate sources of mental energy to feed upon).