He eventually gathered up to 5 million in sages who are completely loyal to him.
Last I checked, people are never completely loyal, especially powerful magic casters. What? His armies have no free will?
Also, the way Sages are given in the history, didn't they come from the other dimension, the Era one? If so, how is it, that there are SO DAMN many?! I can understand a few hundred, and other nomadic ones.
But 5 million? Along with the other armies your characters have? I don't think so....
K2 can correct me if I'm wrong, but I DON'T think there's that many sages.