This user optimizes his gaming experience.
This user might be a mutant in hiding.
I've been planning to do that, too. But then I consider the massive amount of time I'd have to put in to it.
Kudos for seeing it through.
Any reason other than variability for the different colors?
One minion tribe per rune color. While the "original" minions only come in red, blue and purplish (iirc), it makes sense to use yellow and green. Who knows what close proximity to hoards of arcane power does to them?