profiencies are like masteries if you've played D2

the more you play, the more profiencies you'll get
you have to lvl them
for ex: you've reached lvl 2 profiency in earth
so if you use an earth charm, you'll make better dmg ( EE on charm + 2% EE from the profiency )
but those bonuses are not shown on the items ( EE is not added on the item )
you only see the difference when you play with the dmg you make
