There are items that operate without energy.
Anihilation is a range 1-2 phis wep, that needs no energy. In myth form deals 450+ dmg, and -15 drain, 3 uses.
Hook deals 250 dmg, needs no enrgy.
Charge deals 250 dmg, needs no energy.
The drone does need energy...
There is the buldog shotgun, 3 uses in myth form, deals 400+ dmg, -15 res.
Be creative, and you can win(sarcasm).
Actualy find these wepons and invest a huge amount of money in them and you can win.
Downside of them, is that they are close range weps... so if you hitt a heater with new lava, shotgun, and sword... you are scraped.