Phthisic (CR 6)

Large Monstrous Humanoid
Alignment: Always chaotic evil
Initiative: +5 (+1 Dex, +4 Improved Initiative); Senses: scent, darkvision 90 ft., Listen +14, and Spot +14

AC: 18 (-1 size, +1 Dex, +8 natural), touch 10, flat-footed 17
Hit Dice: 6d8+30 (57 hp); DR: 10/silver
Fort +7, Ref +6, Will +8
Speed: 30 ft.
Space: 5 ft./10 ft.
Base Attack +6; Grapple +6
Attack: 2 claws +11 melee, bite +6 melee
Full Attack: 2 claws +11 melee, bite +6 melee
Damage: Claw 1d6+6, bite 1d6+3 and mind feed (see text)
Special Attacks/Actions: Mind feed
Abilities: Str 23, Dex 12, Con 21, Int 10, Wis 16, Cha 6
Special Qualities: cold resistance 20, psionics, regeneration 5
Feats: Alertness; Improved Initiative
Skills: Listen +14, Move Silently +3, Search +8, and Spot +14
Advancement: By character class
Climate/Terrain: Any land and underground
Organization: Solitary or gang (2-4)
Treasure/Possessions: Standard

Source: Psionics Handbook

Mind Feed (Ex): A phthisic that hits with its bite attack deals 1d4 points of temporary Intelligence damage. If this reduces the opponent's Intelligence score to 0, the damage becomes permanent.

Regeneration (Ex): Fire and acid deal normal damage to a phthisic.

Psionics (Sp): At will - brain lock, dimension slide, and skate. These abilities are as the powers manifested by a 15th-level psion.

Attack/Defense Modes (Sp): At will -- ego whip, id insinuation/mental barrier, thought shield.

Born of a damaged mind, a phthisic constantly craves the sweet nectar of sanity to sooth its mental torment, if only for a while. As it feeds on a living being's Intelligence, the victim experiences a sensation of deadly chill.