Another critter: Nightmare Marauder

I got this one somewhere on the web. Whaddaya think?

Nightmare Marauder
Medium Outsider ( Chaos, Evil )
Hit Dice: 10d8 + 30 ( 75 hp)
Initiative: +2 (+2 Dex )
Speed: 30 ft.
AC: 21 (+2 Dex +9 Natural ), Touch 12, Flatfooted 19
Attacks: 4 tentacle rakes + 14 melee, 2 claws +9 melee
Damage: Tentacle rake 2d4+4, claw 1d4+2
Face/Reach: 5 ft. x 5 ft./5 ft. (15 ft. with tentacles)
Special Attacks: Constrict, Gaze Of Madness, Improved Grab, Poison, Spell-Like Abilities
Special Qualities: Damage Reduction 10/+2, Electricity And Acid Resistance 20, Immune To
Poison, Disease And Mind-Affecting Effects, SR 20
Saves: Fortitude +10 , Reflex +9 , Will +10
Abilities: Str 18 , Dex 15 , Con 17 , Int 10 , Wis 12 , Cha 14
Skills: Balance +10 , Climb +12 , Escape Artist +10 , Hide +10 , Listen +9 , Move
Silently +10 , Search +8 , Spot +9
Feats: Blind-Fight , Combat Reflexes , Iron Will
Climate/Terrain: Wildspace, Plane of Shadow, Nightmare Plane
Organization: Solitary (1)
Challenge Rating: 8
Treasure: None
Alignment: Usually Chaotic Evil
Advancement: 11-20HD (Medium) 21-30 HD (Large)

Nightmare Marauders are strange creatures that dwell past the eons that
lie between the stars, beyond the planes as we know them, nestled in the
far realms of insanity. Sometimes an alienist will summon one to the
world, but this is an accident more often then not, for once summoned a
Nightmare Marauder is impossible to control, and brings nothing but
madness and death once released into the world.
A Nightmare Marauder looks like a tall, gaunt humanoid with a hunched
back, they have violet skin that glistens as if covered with mucus. Four
long barbed tentacles grow from the hump on its back, and its rather
spindly man-like arms end in three-fingered clawed hands. The Nightmare
Marauders face is lumpy and lacks any features except for a pair of large
glittering black eyes. Nightmare Marauders do not speak, but they can
communicate telepathically with any creature within 100' that has a
language.
Combat: Nightmare Marauders generally attack anything they encounter on sight.
They seem to be incapable of eating anything, and sages speculate that
they some how feed on the pain and suffering of their victims. Nightmare
Marauders attack by raking with the long barbed tentacles that grow from
their back, and clawing with their hands. The glistening mucus that covers
their bodies acts as a mild poison to all those they injure in melee.
Gaze of Madness (Su): Insanity , as cast by a 14th level Sorcerer, 30 feet, Will negates DC 17
Improved Grab (Ex): To use this ability the Nightmare Marauder must hit a creature of medium
size or smaller with its tentacle rake, if it gets a hold it can
constrict.
Constrict (Ex): A nightmare Marauder deals 2d4+6 points of damage with a successful
grapple check against medium sized or smaller opponents.
Spell Like Abilities (Sp): As a 10th level sorcerer, at will: Blur,
Dimension Door, Grease, Invisibility, Obscuring Mist, Spider Climb ;
3/day: Evard's Black Tentacles, Emotion (Despair, Fear) and Gaseous Form
.
Save DC are equal to 12+ spell level (Where applicable).
Poison (Ex) : Tentacle and claw attacks, Fortitude Save (DC 18); Initial Damage 1 Dex,
Secondary Damage 1d4 Dex.