lol shin, if I recall correctly, come chapter 5 Fradz will suddenly remember lightning elemental (so your skills will be complete), and also promptly forget all skill points used (so you'll be level 20 with 0 skills levelled and zero skill points to use).
This will be a challenging
**** run for you
I should make a quick list of super-serious bugs I think.
Regarding power hammer, atm it does add damage but in a strange way. Firstly equipping or dropping it doesn't affect damage added effect, at least not immediately. Secondly not every kill will contribute to your +dmg. So the current charges don't exactly equal twice your +dmg. I suspect those kills when blazing fury was active don't add, but could be wrong..