The Infirmary allows you to restore a certain percentage of your lost troops using Crystals. To use the Infirmary, go to the Black Market, tap on the "Infirmary" button, and select the units you would like to restore. The lost units will be instantly revived at a fraction of the Black Market Crystal price of each unit. The Infirmary is best used for high-cost units, or when you need to rebuild a large force in a short period of time.
