I think Berserkers should get their full +40% (+20 and +20) against level 10 monsters even when they're at level 10. They're kind of underpowered now as it is, and in vicious dungeons where you basically can't avoid hitting level 10 it's a significant weakness.
I find Berserkers are fine unless they have to beat down a high-level monster with physical resistance and physical damage. This really
hammers him in vicious scenarios outside of Dragon Isles. In most hard scenarios you can get away with the RBS, but in vicious it's a nightmare for the berserker.
As per the flames boon, this isn't quite so subtle an improvement. This allows you to convert the original BURNDAYRAZ for 100 CP and
a refreshment (because you do
have refreshment). It might not exactly be unmerited, but it is a substantial boost.
I'd like to see a small piety cost decrease for mystic balance. Assassins and Warlords get a lot of use out of it, but other classes just don't cast too many spells with 7+ mana cost to get good value out of it.