Cards of Ethernity (CoE) is a digital collectible competitive card play-and-earn game built in the dark fantasy universe known as Aether. At its core CoE is a blockchain-based game, enabling users to trade and sell their cards freely, with the same level of ownership as if they were real, tangible cards. CoE was designed to be a quick, fun, and accessible game, but also offers significant depth, strategy and complexity for more serious players.