WotC posted an image showing the evolution of the Grimlock. One of the images below was not posted by WotC.
Evolution of the Grimlock
- Thread starter Morrus
- Start date
KirayaTiDrekan
Adventurer
Me Grimlock no bozo, me king!
M.L. Martin
Hero
And you've hit on the key reason why I've never given serious thought to using this monster. 
mflayermonk
First Post
All owned by Hasbro.
Samloyal23
Adventurer
I developed the grimlock culture for use with the module that came with the Illithiad. I decided they were mutated humans that had a trait that made them unpalatable by mindflayers but also more vulnerable to telepathy. So the illithids kept them around as guards because they were never tempted to eat their foul-tasting brains. The grimlocks perceived this as a special status and thought of themselves as the elite servitors of the illithids. They strived to be the best possible servants out of all the enslaved races used as cattle by the mindflayers and looked down on races that were regularly eaten by their masters. I even had a prestige class for grimlock hunters who pursued escaped thralls and performed assassinations against Underdark rivals to the illithids like the Drow and Duergar...
