The empire needs power! But not all power is created equal – different gems have different uses, and so you must construct gem-powered Pylons that will be used by the most people. The better you do, the more the empire will reward you. Making them attractive as well will increase your favor among the nobility.
During the game you will buy multi-use cards from a market - often leaving gems behind to pay for them. If there's nothing you want to buy, you can gather all the gems from the market to clear it and fill it with new options. Cards have immediate effects, like building pylons or inserting gems in them for points, but they also have attributes which affect the value of those gems at the end of the game. Even seemingly small choices can have big results!
The player who scores the most points, wins! Co-op and solo modes are included as well, to expand your options for play.
-description from designer