Activating the 30 Min. EXP Buff for 50 Energy is currently a terrible ordeal for you have to: 1. Keep an eye out and do it every 30 min, 2. Always run away from mobs as any tiny dmg will Close Black Spirit and you got to do all clicking again (and it takes so long to get to the Exchange screen) + It's super easy to double-spend the 50 Energy as there is no confirmation window nor any mechanic preventing you from spending all energy overwriting the buff.
Please make Energy burning toggleable like Agris Fever - Just click and burn 50 Energy till i run out or disable.