its good how it is now, that PvP, PvE and PvB uses same "energy". Because if they would ever made separate sources, they also have to remove univerzal DEable loot from PvP. Because to have separate energy only for PvP would lead to ppl with tons and tons of rubies from PvP used for refils for PvE. And that would lead to ppl have everything very fast and lose interest in game...
Great game, only i thing. Im doing way more clicking on lvling heroes than fighting. Click damage is way too low compared to DPS. Its not even worth to click little later in the game. Besides this one little issue surprisingly very entertaining for idle game.
 "Chronicles of Blood"){kind=icon}
 "Clicker Heroes"){kind=icon}