[Endoperez]

Johan:
We can't mod Carrion Woods, but can assign Carrion Woods' spells as national spells for base Pangaea. That's what we were planning.

tinkthank:
As castle defence is (str^2)/100, giving your troops lower strength and higher damage in weapons should do what you want, mechanic-wise. As an example, str 9 and new Hunting Spear with damage 4 will have the same effect str 10 and spear with damage 3 would, but (9^2)/100=~0.81 is lower than (10^2)/100 = 1. This also makes them weaker in storming castles.
Javelins', slings' etc. range is affected, though. But I'm not even sure if we can mod range to depend on strength.

I can take a look in the mod, but can't help with graphics. I could try, but you should really find someone with artistic skills.