Illithid Grapple( Complete Psionic, p. 61)
You embrace more of your illithid heritage, and grow at least one long purplish tentacle that you can reveal and unfurl when you open your mouth.
Illithid Heritage*, one other illithid feat,
Illithid Extraction (CP) ,
You gain a natural tentacle attack. If you can use weapons, you retain that ability, as well as any other natural weapons you have. If you are fighting without weapons, you can use your tentacle or another natural weapon as a primary attack. If you are armed with a weapon, you can use your tentacle or your weapon as a primary attack. If you make a full attack, you can use the weapon as your primary attack along with your tentacle as a natural secondary attack. The tentacle does not improve your natural reach. Your tentacle deals 1d4 points of damage, and you can use your Dexterity modifier in place of your Strength modifier on attacks with your tentacle if you have the Weapon Finesse feat. Additionally, you gain the improved grab special ability that you can use only with your tentacle, allowing you to initiate a grapple as a free action, without provoking attacks of opportunity, each time you hit with a tentacle attack. You can only attempt to grapple creatures within one size category of you with your tentacle.
You can take this feat up to four times. Each time you do so, you gain an additional tentacle. Once you have gained all four tentacles, the lower half of your face transforms to resemble that of an illithid. As a full-round action, you can give up any other attacks you have to attack with as many tentacles you possess, as described above, and can attempt to initiate a separate grapple with each tentacle as a free action. You do not gain cumulative bonuses for each tentacle already attached (as an illithid would).