Step 1: Insert Larva into mind.
Step 2: ???
Step 3: Profit!
This larva is found at the end of the Temple of Ahn'Qiraj. Interacting with the larva, will prompt an "Inserting Mind Larva" action and start up a minigame called Mindcraft similar to 
[JewelCraft] but with a more fitting flair. This activity is part of the puzzle for obtaining the 
[Lucid Nightmare].
Patch changes
Patch 7.3.0 (2017-08-29): Added.
