if there is a big shortage of energy cuz of the -1 regen wouldnt the zealous be a smart choice and just go with -2. you can use one cyclone axe and u would be able to get all your mana back
Level 13 Required... +15% and -1 Energy regen on the base is very harsh. 15% over 50% hp or 15% while enchanted (since enchantments will give the -1 regen anyways) is more desirable.