How to Fix Xerath

At the present moment is seems that is on a rampage controlling all the top bans. As a solution, I propose a quick and simple nerf, which is to take away his passive, and instead give him passive. Alternatively, you could give him passive. Finally, his blue mana bar has devastating synergy with his blue color of the champion model, so to tune down his overpowered state, we need to change his resource from mana to energy or no cost to be rid of this monster once and for all.