Tertiary, the main problem is that, I have really good defensives. I would rather have something that I could do some damage with to support my flying troops and people who use stone armor probably would be really slow and go against my biggest advantage of having tons of mobility (I am not saying elephants are particularly fast, but they would do better in rough terrain anyways) 

I have also toyed around with the idea of having Minotaurs being a part of my nations races, though I am not quite sure I am just kind throwing the idea back and forth.