Night
Could you go into more detail regarding the prevalence of races? How will you arrange the towns? Who prevails over whom?
Next up: Humans. First level is fodder, second—pretty strong archers, third—another archer-catapult or an awesome powerful spearman. Cavalry is so-so, but as for angels...
Nature is pure fodder, except for mantises and elves, but on the other hand, you can summon a ton of troops.