The Blood of Humans is the first step of the downward path of Abysia
Fire resistant soldiers for 13 gold is not bad.
4 gems is of little importance.
Good point on the 2 heat points loss.
Most mages only at home, but new cheap mage.
We have tried not to make themes more powerful than the default. It is better to tweak up weak ones later than having a overly strong theme that affects MP balances.