Nigon is the second underground race.

So, it turns out that the Necropolis faction will be completely immune to Nighon's racial ability, which is a clear imbalance.

Master of Mind - cool, logical. Go ahead, sit down and write the code.

Firstly, I don't have that kind of knowledge, and secondly, Arandor already said that it's just a theoretical concept (at least for now), so why can't such an ability exist purely theoretically? Especially since you yourself say it's cool and logical. (unless it was said ironically)