Talk:The Celestial Dragons/@comment-67.176.72.168-20140807011307/@comment-199.60.19.55-20140807215552

It's cheaper to summon the boss that is currently active. This might be the most cost effective option if you just can't kill the boss using energy. Once you finish one of these events, you'll find yourself permanently powered up. Next step is to gun for more epics and you're close to the pinnacle of this game. That's probably still a few months away for you. Good luck!