This is the second part of the two part event to win several rewards. The first, and most appealing to those in the diamond leagues is the chance to become immortalized by being in the top 6 teams and obtaining a 3d statue and custom portrait for their members.
Rules on how this works here
Pocket Gems aren’t making it easy in this second half of the event, with additional acres only earned by using the Inner Fire boosts. With several dozen hours of farming chests, I can safely say that your resources will be stretched to attain the top level prizes here.
If your league is willing, try to arrange a boost truce. This means that all players don’t put defensive boosts on their base in order to reduce the acres stolen by their enemies. As personal rewards are usually more meaningful in the long run, this means all players in the league will benefit.
If you want to make sure your enemies don’t steal as many acres, you need to make sure that each and every single tower is boosted. Even those with no towers on the island!