What is the Energy Collection technology?
Energy Collection is a new technology that will improve the rate at which you harvest Blue Energy. After building your Spectral Ruins, Energy Collection can be found in the Science Center and can be upgraded like all other forms of research.
Raising the level of your Energy Collection research will allow you to increase your hourly production of Blue Energy. Much like the other resource technologies, each level of Energy Collection will increase the production of Blue Energy by 5%.
Important: Only troops that have been defeated in player versus player battles can be revived in the Spectral Ruins. In addition, you will be unable to revive any troops that were defeated when reinforcing your alliance member's City or Outpost. If you are being reinforced, you will be able to recover Souls from all troops lost in your City or Outposts.