No. You do not need to buy anything. On the upper left between the Championship Warfare and the gem count is the Royal Challenge. It shows the hero that you have to beat next. Once you beat that hero it advances to the next one. The hero may or may not join you when you beat him. If he does not you can keep on attacking him and every time you beat him there is a chance that he will join you. Look at the Index to formations http://bbs.tynon.com/showthread.php?6406 in the Story and Lore section for the treads that discussed the formations to beat the heroes and monsters.


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