Board Thread:Game Discussion/@comment-11210192-20130625000712/@comment-2067839-20130625033717

How close were you to killing it? If you're close, wait until you have 10 energy, fight with three of your knights plus two friends, then wait half an hour and finish it off with one knight (or if not quite that close an hour and a half and two knights; use one of your knights plus a friend for even more damage).

For the most possible damage without spending crystals:  Wait until you have 10 energy. Fight it with 2 of your knights plus your two most powerful friends. Wait an hour and a half (it won't despawn until 2 hours), finish it off with 1 of your knights plus your two next-most-powerful friends.

If you only have a few really strong friends, do the first fight just before your daily friend limit is going to finish. Then you can use the same two friends for the second fight. This is a good way to get the last kill you need for a reward, since the reward levels jump in difficulty.