Forging.... one of the more interesting ways to give your units an advantage, by upgrading a weapon's stats (though not without paying coin, of course).
I find myself using this mechanic pretty often, as I enjoy just making certain weapons much stronger than before, and also giving said weapons a not so creative new name. Of course, this requires a ton of gold to do so, but I personally find it worth the trouble.
So, how often do you forge? How big are your adjustments to the weapons you forge? Do you also name your weapon?