You're going to need a lot of vassals and soli if you intend to create an immortal crew, and these Silver and Blood codes are going to earn you both for free, and even more. From these Silver and Blood codes, you can get Soothing Embrace, which is the currency used in the gacha to get new Vassals, Soli (or the equivalent of Gold in other games), but also Moon Tears, which are the premium currency. Process to redeem Silver and Blood codesStep 1 : Tap on the four squares (Menu) next to your profile. You can get one additional code that will give you 300 free Moon Tears!If you can't redeem Silver and Blood codes, it might be possible that you're trying to redeem one that isn't active on your server. They have a particularly beautiful design, leaning towards a more dark anime style, which only makes Silver and Blood that much more appealing to me.