User blog comment:Emptylord/Champion reworks/Butthurt Patch Notes/@comment-24474109-20160519190642/@comment-3974211-20160520035339

Aye, Energy is currently reserved for Ninjas and Monks, but it's a suitable resource for a champion that you want to have a "soft" down time beyond cooldowns. The point of energy is that it's users become exhausted if they strain themselves but, unlike mana, it's not a permanent silence.