Yes it is a waste of time and resources - I actually leveled it up to 9 early on thinking it would help my pet mage (first extra hero) to do more damage.

DO NOT, I repeat, DO NOT level up Illuminated Mind. It may be there for the logical addition of a Mage-class character hero. But that is not in this Beta.

It's all part of being the first on the game. Mages will be awesome though when / if they appear for us as a base character.