Sky Conquest is a mini-game that offers extra rewards. You can enjoy one free run per day, or spend diamonds to participate in additional runs.
Each run consists of a series of territories that you must progress through sequentially. In each territory, you are dealt a number of cards and must choose one. Each card can provide a random reward or cause you to lose all loot collected up to that point. Some territories contain only rewards, and these are clearly highlighted.
More advanced territories offer better rewards. However, you can leave at any time and obtain the loot collected up to that point. If you are dealt an attack card that would cause you to lose your loot, you can pay diamonds to avoid losing the items and continue with your “run”.