I just played a Toorum, and while my normal carried weapons were an axe and shield, I discovered that by anticipatinging when the next level-up would occur and
picking up a staff or orb when the final EXP for Level Up was made, I would gain extra permanent energy. Anything that adds willpower will act this way.
So for Toorum this is a good way to bulk up, as energy was frequently the limiting factor during combat.