Berserkers are absolutely overpowered in Arena mode. I found no good regen infusions, no shielding runes until late (when I didn't need them anymore), no heavy armour until halftime and no damage penetration until the final round - still breezed through most of the fights. I had 5/5 Unstoppable ready for emergency situations and didn't even use it once - Bloodbath, Vitality and Fast Metabolism provided more than enough regeneration to keep me going. Movement was my main issue and I think Steamroller might have been a better Prodigy choice than Draconic Body as it would allow me to quickly deal with multiple archers and spellcasters scattered around the battlefield.
Also, though it pains me to admit it, Dwarf may not be the optimal racial choice since you don't get enough gold to fuel Power is Money.
Next stop: Nightmare Arena
