A Castle can be used to mint new Knights with a discount. The discount increases based on the amount of Knights it has minted. The more Knights a Castle mints, the better the deal gets to mint a new Knight.
A Castle is a DAO and the Knights from it are the DAO’s members.
Castles can level up. High tier Castles can even issue custom tokens. ERC20 and/or ERC721.
Knights from a Castle can have exclusive skins. Castle art design is customized.
The Castle Smart Contract is upgradable. They will have more features as the game developments.