Quote Originally Posted by Casuir
Weapons are improved by bonuses in the buildings file and chevrons are gained by experience in battle and by building bonuses on recruitment. The bonuses they add look to be hardcoded and probably the same as in rome. +1 for weapons, not sure about exp

The armour upgrading looks to be a straight +1 as in rome, the only thing thats been added is different visual models for the upgrades and a way to specify which level of smith a unit gets upgraded at. Looks to be a limit of 6 lvls of armour and 3 upgrades per unit. The actual names of the armour levels can be specified by faction in the expanded.txt file in the text folder. Looks like the ex line is a feature that didnt make the final cut, what we got is nice enough though.
So the weapon and armor upgrade is a +1 for each level always? When I read the unit text file some have their base level at 5 and the next level at like 7. But that line as Musashi said is commented out.

So I guess I can only specify how many upgrades there are for each unit and what smith level is required but not what each level adds.