Board Thread:Game Discussions/@comment-83.220.236.254-20131206144305/@comment-80.47.85.219-20140108221501

I've reached 20 without paying, it's easy. You just fight and accumulate free arena energy, then when all the free energy runs out (A lot of it is one-time only because of the nature of the milestone system) use 9 gems you've earned from quests and shit to get 10 more energy and rock on to 20.