The event lasts for 3 days in which you can try to destroy the portal.
During the event period a Hades portal spawns in all your cities. You goal is to destroy the portal before the time runs out. In order to destroy the portal, you have to collect 6 Hades stones. Hades stones can be found whenever you start an adventure in the portal. The adventures take time and require some units. Completing adventures provides you with resources or favor. Additionally you have the chance to find a Hades stone, but there is always the risk to loose all units you sent into the portal. After collecting all 6 stones you can destroy the portal and collect the final reward. If you play actively you can also gain an exclusive award.
How to open the portal
You can open the portal by clicking on the portal image in one of your cities. There is only one portal which you can access from all of your cities.
Send units into adventures in order to find the 6 Hades stones. After collecting all 6 stones you can destroy the portal and collect the final reward. As soon as you have destroyed the portal you cannot access it any longer and start adventures.
How to get the stones
In the portal you can start different adventures. Every adventure lasts a specific time. In order to start the adventures, you need the required number of units. At the end of every adventure you are rewarded with some resources and favor. Additionally you have a certain chance to find the Hades stone, but keep in mind that there is always the risk to loose all units you sent into the portal.
After collecting all 6 stones you can destroy the portal.
Destroying the portal will remove the portal from your cities and put 6x the item "Land expansion" into your extended inventory. Activating "Land expansion" in one of your cities gives you +100 free population in this city.
You can gain the following award when you destroy the portal.