I have class mod for level 10 and im a 12 and they still cant be used . because the class mod area is still locked.
you have to get to a point in the story and it unlocks
Class mods and your rune mods unlock as your progress through the story of the game just like DrivenDemon said…
i am on chapter 6 and my class mods still have not unlocked even though i am level 13
I was level 15 by the time i did that part of the story to unlock them.