You can't have constant >+4 energy regen however a few things will help you out.
Offering of Blood - Sacrifice life to regain energy (blood)
Soul Reaping - The best prof specific skill out there in my mind - specially if you're a mm. For every point in soul reaping you gain that much energy when something dies.
Edited to say - Can't upgrade truncheons or grim cestas I'm afraid. Casters only get to mod Staffs.
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