Relics grant additional attributes to your troops when activated and upgraded. There are three relics for each troop type, and you’ll need a certain amount of Rejuvination Stones to unlock and enhance each relic.
Each relic provides stat bonuses to both troops and heroes based on the troop type. Once all three relics of a specific troop type reach a certain star level, you’ll unlock additional bonus attributes.
To view your relics, tap on the Treasury building, then select Relics.