If you want to complete the full set Check out the Mindflayer Terrain accessories!

I have something Great for you!
Its the Elder Brain Shrine!
My compy just dug it up last week!  Its a beautifuly crafted shine that pools the Elder Brain in its nutriant rich fluids. They say when allerted to dangers the Brain will rear up!
We however did not collect the Elder Brain as well that would have been a complete disaster!..... oh no... what have you done! 
You look at the next container they are bringing in... You are shocked to find it is infact the Elder Brain... once your eyes are upon it. You feel this shattering pain in your head as you crumble to the floor.