• [2018/06/22]
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Bug - Normal Levelling up a fighter from using Power Up doesn't refill their energy

You actually do get the energy, but currently the game won't recognize it until you either restart the app, or make a server call (like opening a relic). In addition to fixing the current issues, we plan on refactoring the system so that eventually you will get the energy if the app is backgrounded rather than exiting, as @KeenFox mentioned.