Using Reaping Mauler to Extract Brains (3.5e Optimized Character Build)
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I was bored on day and I was looking through complete psionics, saw the flayerspawn guy, and thought, "Hey, I should check out these Illithid Feats" And after seeing Illithid Grapple, I knew, reaping mauler had a new purpose.
Players Handbook, Complete Warrior, Complete Psionics, Expanded Psionics Handbook
 Game Rule Components
Powers, and Feats
Starting Ability Scores (Before Racial Adjustments): Dex 17, Int 15, Str 13, Wis 12, Con 10, Cha 8
Race (Templates): Human
|Saving Throws||Feats|| Class
|1st||Psion 1||+0||+0||+0||+2||Human: Illithid Heritage, 1st Level: Illithid Compulsion, Bonus: Psionic Talent||Powers, effective psion level 1, discipline: Telepath||Learn Psionic Charm Person at 1st Level Powers Known|
|2nd||Psion 1/Swashbuckler 1||+1||+2||+0||+2||Bonus: Weapon Finesse||Bonus Feat||none|
|3rd||Psion 1/Swashbuckler 1/Monk 1||+1||+4||+2||+4||3rd Level: Illithid Grapple, Bonus Feats: Improved Unarmed Strike, Improved Grapple||Unarmed Strike Damage 1d6, Flurry of Blows -2/-2||none|
|4th||Psion 1/Swashbuckler 1/Monk 2||+2||+5||+3||+5||Bonus: Combat Reflexes||Flurry of blows -1/-1||none|
|5th||Psion 1/Swashbuckler 1/Monk 2/Fighter 1||+3||+7||+3||+5||Bonus: Multi Weapon Fighting||none||none|
|6th||Psion 1/Swashbuckler 1/Monk 2/Fighter 1/Flayerspawn Psychic 1||+3||+7||+3||+7||6th Level: Clever Wrestling, Bonus: Illithid Blast||Illithid Blast (15ft cone, stun 1d4 rounds)||none|
|7th||Psion 1/Swashbuckler 1/Monk 2/Fighter 1/Flayerspawn Psychic 2||+4||+7||+3||+8||Bonus: Illithid Grapple||Powers, effective psion level 2||none|
|8th||Psion 1/Swashbuckler 1/Monk 2/Fighter 1/Flayerspawn Psychic 3||+4||+8||+4||+8||none||Illithid Blast 2/day||none|
|9th||Psion 1/Swashbuckler 1/Monk 2/Fighter 1/Flayerspawn Psychic 4||+5||+8||+4||+9||9th Level: Illithid Grapple, Bonus: Illithid Grapple||Powers, effective psion level 3||none|
|10th||Psion 1/Swashbuckler 1/Monk 2/Fighter 1/Flayerspawn Psychic 4/Reaping Mauler 1||+6/+1||+10||+6||+9||Bonus: Mobility||none||none|
|11th||Psion 1/Swashbuckler 1/Monk 2/Fighter 1/Flayerspawn Psychic 4/Reaping Mauler 2||+7/+2||+11||+7||+9||none||Adept Wrestling +1|
|12th||Psion 1/Swashbuckler 1/Monk 2/Fighter 1/Flayerspawn Psychic 4/Reaping Mauler 3||+8/+3||+11||+7||+10||12th Level: Illithid Extraction||Counter grapple, Sleeper Lock||From here on I think the jest is pretty basic, you could try putting other classes here to 20, see how it works. I'd suggest 5 levels reaping mauler for devastating grapple. Insure your tentacles kill.|
 Other Components
Its important to watch your skills, because most of these classes don't have the skills you need for the prestige classes in their skill lists, so try to make sure you get the necessary skills up to what is needed as soon as possible, so you don't have to worry about it.
I think after examination, the use of reaping maulers grappling prowess, and Illithid feats that give you tentacles and mind sucking ability, it doesn't matter what your enemy is, once pinned, its gonna die. And the fact that you can have 4 enemies pinned at a time, is just so fun (One with each tentacle). Also the improved grab feat that is automatic for your tentacles helps pin things, and flurry of blows at lower levels is a real life saver, these in combination with combat reflexes.
 Side Notes
If you rolled High for str and wisdom it would be really good (AC and grapple checks) If you got higher strength than dexterity, consider an additional fighter level instead of 1 level swashbuckler, its the same thing at first level, except what the feat is.
 DM Counters
Anything difficult to pin, such as a group of rangers in the back of the enemy group.
Undead, Constructs, really anything without a brain.
A Slayer with Brain Nausea.
Ring of Freedom of Movement. Improved Sunder becomes a great feat to have access to for this reason.
Flying anything, without a friendly Wizard to help you out.