Use this card on the NBM website to claim a free material that can be used to create Isotonics. It can only be used if the player holds a rank of 3 (PRIVATE FIRST CLASS) and can only be used to claim a discovered material of a given rarity if the user has discovered at least 3 materials belonging to this rarity. For more information, check the NBM official wiki. https://nbmofficialwiki.gitbook.io/nbm-shadow-depths/overview/nft-battle-miners-official-wiki/iv-nbm-nfts/nft-assets