It indicates how powerful a card is. To level up, it will be necessary to battle and obtain experience points (Stardust) and the use of the game's internal currency (GQ) that can only be obtained by playing and winning battles in Underground Waifus.

In addition, the higher the level of improvement for the card, the longer the waiting time for its evolution to be completed, and the cards that are leveling up, will not be able to be used.

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