At the beginning, each player is given a cage NFT for free (players only need to pay transaction fees for the first cage NFT) and it will randomly give birth to one character with a random rarity level. The rarity level of a character ranges from Common, Rare, Super Rare, Epic, to Legend. The higher the rarity, the lower the success rate of you opening a cage NFT with that rarity level and the more abilities your character can be equipped with. Also, each character will have these stats: health, attack, and defense.