A phthisic stands 10 feet tall and weighs 600 pounds. It vaguely resembles the person whose mind the phthisic escaped from, but is severely distorted (someone who knows the individual from whom the phthisic sprung can make a DC 25 Spot check to note the resemblance).
A phthisic speaks the primary language of the mind that birthed it, usually Common.

Mind Feed (Ex): A phthisic that hits with its bite attack deals 1d4 points of Intelligence damage. If this effect reduces the opponent?s Intelligence score to 0, the ability damage becomes ability drain.
Psi-Like Abilities: 3/day?brain lock (affects animals, fey, giants, humanoids, magical beasts, and monstrous humanoids, DC 15*), dimension slide, ego whip (1d4, DC 15*), mental barrier, mind thrust (ML 4th, 4d10, DC 15*), skate; 1/day?body adjustment (heal 1d12*), catapsi (DC 18). Manifester level 6th. The save DCs are Charisma-based.
*Includes augmentation for the phthisic?s manifester level.
Regeneration (Ex): Fire and acid deal normal damage to a phthisic.

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System Reference Document -> List of Creatures (SRD)