Board Thread:Game Discussion/@comment-50.131.44.49-20130829003732/@comment-195.179.63.253-20130829103052

Also, usually there are side quests for the tournament which fits the boss, so there's some chance you get enough gems to revive at least once without in-app payments.

If you've got enough strong friends or the boss is almost beaten, better refill the Epic Energy (10 gems) instead of revive (12 gems).

And though it might be obvious: Look at the elements of the boss. A seemingly weaker armor (or friend) might be better if the elements fit. Mind the armor for arena and boss fights can be different to the main game level's one, i.e. your hero can wear the armor strongest against the boss without having to change it all the time.