EDIT: Since there is an official 4e intellect devourer, I won't be updating these guys.
INTELLECT DEVOURER
Intellect devourers are dangerous psionic creatures that resemble a brain with four legs that allow it to move quickly and initiate vicious physical attacks. Intellect devourers are often kept as “pets” by mind flayers, but they are also encountered on their own or in command of other, lesser creatures.
INTELLECT DEVOURER CREEPER--- Level 13 Lurker
Small aberrant magical beast--- XP 800
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Initiative +15; Senses Perception +15, blindsight 8
HP 105; Bloodied 52
AC 27; Fortitude 26; Reflex 27; Will 25
Speed 7
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[Melee basic] Claw (standard; at will): +18 vs. AC; 1d4+2 damage.
[Melee] Fourfold Claw (standard; at will): The intellect devourer creeper makes four claw attacks at the same opponent. If the intellect devourer creeper has combat advantage, it deals an extra 2d6 points of damage if at least two of these attacks hit.
[Ranged] Mind Tap (standard; at will) Psychic: Range 20; +16 vs. Will; 1d10+6 psychic damage. If the intellect devourer has combat advantage, the target is also dazed (save ends).
[Area] Moment of Dominance (standard; encounter) Charm: Burst 2 within 8; attacks each creature in burst; +14 vs. Will; Hit: the target immediately slides 2 squares and makes a basic attack at a target of the intellect devourer creeper’s choice.
Fade Into Darkness (move; at will): The intellect devourer creeper moves 7 and gains concealment until the end of its next turn.
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Alignment chaotic evil; Languages telepathy 10
Skills Intimidate +15, Perception +15, Stealth +16
Str 15; Dex 20; Wis 18
Con 21; Int 23; Cha 19
INTELLECT DEVOURER PARASITE--- Level 14 Controller
Small aberrant magical beast--- XP 1000
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Initiative +12; Senses Perception +16, blindsight 8
HP 141; Bloodied 70
AC 28; Fortitude 26; Reflex 28; Will 26
Speed 7
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[Melee basic] Claw (standard; at will): +19 vs. AC; 1d4+2 damage.
[Melee] Fourfold Claw (standard; at will): The intellect devourer parasite makes four claw attacks at the same opponent. If at least three of these attacks hit, the target is dazed until the end of its next turn.
[Melee] Brain Parasite (standard; only against a dazed, stunned or unconscious bloodied target; encounter): The intellect devourer parasite attempts to force itself into the victim’s head, through a combination of psionic phasing and shrinking. Once there, it gains control of the victim. +18 vs. Will; Hit: 3d10+6 psychic damage, plus the intellect devourer parasite moves inside the victim’s head. While this power is active and the victim is alive, only attacks with the Psychic or Fear keywords can target the intellect devourer parasite, and the parasite’s victim may make a Wisdom attack vs. the intellect devourer’s Will to expel it as a standard action on its turn. If the victim dies, the intellect devourer parasite is stunned until the end of its next turn and can be targeted normally.
Parasitic Domination (standard; only against the target of Brain Parasite; at will) Charm: +18 vs. Will; Hit: target is dominated until the end of the intellect devourer parasite’s next turn; Miss: the target may make an immediate attack against the intellect devourer parasite’s Will defense to expel it.
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Alignment chaotic evil; Languages telepathy 10
Skills Intimidate +17, Perception +16, Stealth +18
Str 15; Dex 20; Wis 18
Con 21; Int 24; Cha 20
INTELLECT DEVOURER HOUND--- Level 18 Brute
Small aberrant magical beast--- XP 2000
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Initiative +18; Senses Perception +20, blindsight 8
HP 214; Bloodied 107
AC 30; Fortitude 31; Reflex 33; Will 30
Resist all 5
Speed 8
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[Melee basic] Claw (standard; at will): +21 vs. AC; 1d6+2 damage.
[Melee] Fourfold Claw (standard; at will): The intellect devourer hound makes four claw attacks at the same opponent. If at least three of these attacks hit, the target is knocked prone.
[Melee] Savage Rend (standard; only against a prone target; at will): +19 vs. Fortitude; 2d6+7 damage plus ongoing 5 damage.
[Close] Psionic Bark (minor; recharges when first bloodied) Fear: Close blast 3; targets each enemy in blast; +17 vs. Will; Hit: target is immobilized (save ends); Miss: target is slowed until the end of its next turn.
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Alignment chaotic evil; Languages telepathy 10
Skills Intimidate +17, Perception +20, Stealth +23
Str 15; Dex 28; Wis 22
Con 24; Int 20; Cha 17
INTELLECT DEVOURER BARKER--- Level 19 Artillery
Small aberrant magical beast--- XP 2400
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Initiative +17; Senses Perception +21, blindsight 8
HP 143; Bloodied 71
AC 31; Fortitude 30; Reflex 31; Will 29
Speed 8
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[Melee basic] Claw (standard; at will): +26 vs. AC; 1d4+2 damage.
[Melee] Fourfold Claw (standard; at will): The intellect devourer barker makes four claw attacks at the same opponent.
[Ranged] Ravage Intellect (standard; at will) Psychic: Range 10; +24 vs. Will; 2d6+7 damage and target is dazed (save ends).
[Close] Psionic Bark (standard; at will) Psychic: Close blast 3; targets each enemy in blast; +22 vs. Will; Hit: 1d6+7 psychic damage and target is immobilized (save ends); Miss: target is slowed until the end of its next turn.
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Alignment chaotic evil; Languages telepathy 10
Skills Intimidate +19, Perception +21, Stealth +22
Str 15; Dex 26; Wis 22
Con 23; Int 24; Cha 21
INTELLECT DEVOURER DIRECTOR--- Level 20 Controller (Leader)
Small aberrant magical beast--- XP 2800
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Initiative +15; Senses Perception +22, blindsight 8
Psychic Static (Psychic) aura 8; all allies of the intellect devourer director gain resist psychic 10, and any of their attacks with the psychic keyword deal an extra 1d6 points of psychic damage on a hit
HP 191; Bloodied 95
AC 34; Fortitude 32; Reflex 32; Will 35
Speed 8
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[Melee basic] Claw (standard; at will): +25 vs. AC; 1d4+2 damage.
[Melee] Fourfold Claw (standard; at will): The intellect devourer director makes four claw attacks at the same opponent. If at least three of these attacks hit, the target gains vulnerability to psychic 10 (save ends).
[Area] Moment of Dominance (standard; recharge 6) Charm: Burst 2 within 8; attacks each creature in burst; +22 vs. Will; Hit: the target slides 2 squares and makes a basic attack at a target of the intellect devourer creeper’s choice as a free action.
[Melee] Brain Parasite (standard; only against a target that has vulnerability to psychic or is dazed, stunned or unconscious; encounter): The intellect devourer director attempts to force itself into the victim’s head, through a combination of psionic phasing and shrinking. Once there, it gains control of the victim. +24 vs. Will; Hit: 4d8+7 psychic damage, plus the intellect devourer director moves inside the victim’s head. While this power is active and the victim is alive, only attacks with the Psychic or Fear keywords can target the intellect devourer director, and the victim may make a Wisdom attack vs. the intellect devourer’s Will to expel it as a standard action on its turn. If the victim dies, the intellect devourer director is stunned until the end of its next turn and can be targeted normally.
Parasitic Domination (standard; only against the target of Brain Parasite; at will) Charm: +24 vs. Will; Hit: target is dominated until the end of the intellect devourer director’s next turn; Miss: the target may make an immediate attack against the intellect devourer director’s Will defense to expel it.
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Alignment chaotic evil; Languages telepathy 10
Skills Intimidate +25, Perception +22, Stealth +20
Str 15; Dex 20; Wis 22
Con 23; Int 24; Cha 30