First open the the glory of the king game, click the "Prepare for War" option in the menu bar below, and select the "Customize" item in the small page that pops up.
Second, click on the "internal performance" option on the next page and select "special effects back to the city".
Third, then we can see the permanent special effects and experience cards we have. We choose a special effect that we want to set. Here, take "Circle Ice Cool" as an example, and click the "Circle Ice Cool" special effect.
Fourth, you can preview this special effect of returning to the city later. If we feel satisfied, click on the "circle cool" special effect back to the city.
5. If you only want to use it for the current hero, select "Single Hero Use"; If you want to use it for all heroes, select "Use for All Heroes" and click "OK" in the pop-up window.