Piercing skillups must be based on the dex stat. On dark blue mobs with a 90 dex buffed my piercing is going up soooo slow. Like a tool, I have not been using frenzy ha. 1hb on the other hand with a 130 strength has been going up nicely on dark blues. I'm using the 7 24 mines dagger.
I know its going to get better when I get stronger dex buffs and quickness.
20 shammy test farming Kurn's for gear !