Random nft generation for a game like cryptoblades

Hello, i have watch all videos about NFT i can find and 99% of this videos are about preminted NFT that are going to be sold on a market like Opensea. But what about nft games? I use the example of cryptoblades because thatโ€™s what i want to learn to do. You have 5 differents rarity (R1,R2,R3,R4,R5) of a character and the only difference is the image will show the rarity in a corner, this NFT are not preminted, so how they do it? i really cannot find anything about this kind of minting used on games.

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It may be easier then you expect, it looks like they use randomness to generate those rarities and they save them as properties for that item:

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