Voidmind Grimlock (CR 2)

Medium Monstrous Humanoid
Alignment: Usually lawful evil
Initiative: +2 (Dex); Senses: blindsight 40 ft., scent, Spot +3, and listen +5

AC: 20 (+2 Dex, +8 natural), touch 12, flat-footed 18
Hit Dice: 2d8+6 (15 hp); DR: 5/magic
Fort +5, Ref +5, Will +2
Speed: 30 ft.
Space: 5 ft./5 ft. (tentacle up to 10 ft.)
Base Attack +2; Grapple +6
Attack: Battleaxe +6 melee and tentacle +6 melee
Full Attack: Battleaxe +6 melee and tentacle +6 melee
Damage: Battleaxe 1d8+6/x3, tentacle 1d6+4
Special Attacks/Actions: Cone of slime, constrict 1d6+6, improved grab, sentient tentacle
Abilities: Str 19, Dex 15, Con 17, Int 12, Wis 8, Cha 4
Special Qualities: immunities, mind flayer host, SR 12
Feats: Alertness; Combat Reflexes; Great Fortitude; Track
Skills: Bluff +1, Climb +6, Escape Artist +6, Hide +4*, Intimidate +1, Spot +3, and listen +5
Advancement: By character class
Climate/Terrain: Underground
Organization: Solitary
Treasure/Possessions: Standard

Source: Monster Manual III

Cone of Slime (Su): Once per day, a voidmind grimlock can spray forth a 30-foot cone of slime from inside its skull that deals 2d6 points of acid damage (Reflex DC 14 half). Any creature damaged by the slime takes a -2 penalty on Will saves and is stunned for 1d4+1 rounds (Fortitude DC 14 negates the stunned effect). The save DCs are Constitution-based.

Constrict (Ex): A voidmind grimlock deals 1d6+6 points of damage with a successful grapple check when grappling with its tentacle.

Improved Grab (Ex): To use this ability, a voidmind grimlock must hit a Medium or smaller creature with its tentacle attack. It can then attempt to start a grapple as a free action without provoking attacks of opportunity. A voidmind grimlock has a +4 racial bonus on grapple checks made with its tentacle. If it wins the grapple check, it establishes a hold and can constrict.

Sentient Tentacle (Ex): A voidmind grimlock's tentacle attacks of its own accord. The creature can direct it to attack certain targets, but the psionic nature of the tentacle enables it to flex and move in combat without hindering the creature's other combat abilities. A voidmind grimlock that has successfully grappled a creature with its tentacle can attack another creature at no penalty, as long as that creature is within 10 feet.

Immunities (Ex): A voidmind grimlock has immunity to acid, gaze attacks, mind-affecting spells and abilities (charms, compulsions, phantasms, patterns, and morale effects), visual effects, illusions, and other attack forms that rely on sight. It is also immune to ability damage, ability drain, and energy drain.

Mind Flayer Host (Su): A voidmind grimlock's mind flayer masters are instantly aware if the creature takes any damage, wanders our of range of their control, or is the target of any magic.

Also as a result of this bond, the masters can, as a standard action, see and hear through the eyes and ears of their bonded voidmind grimlock to a range of five miles. Maintaining this link requires a mind flayer to concentrate, but the mind flayer remains aware of its surroundings and can move normally.

Finally, any one of the three masters can take control of the voidmind grimlock, at will, as the dominate monster spell (no save). While controlling the voidmind grimlock in this fashion, a mind flayer can manifest its own innate psionic abilities through the voidmind grimlock, as though the creature were manifesting the ability itself. Any of the mind flayer's psionic powers used in this fashion can target or affect creatures within range, line of sight, and line of effect of the voidmind creature. So, for example, a mind flayer can use plane shift to send the voidmind grimlock to another plane, or it could send itself to another plane. likewise, the mind flayer could use suggestion on a target it sees through the voidmind grimlock's eyes.

Skills: Voidmind creatures have a +4 racial bonus on Bluff, Escape Artist, and Intimidate checks. *In addition, a grimlock's dull gray skin helps it hide in its native terrain, conferring a +10 racial bonus on Hide checks when the creature is in mountains or underground.

In a battle, a voidmind grimlock uses its cone of slime attack, attempting to catch as many opponents in it as possible, before resorting to its weapon and tentacle attacks.