Crypto Legions Greenstone is a blockchain-based strategy game where players build and command armies of unique crypto-backed creatures. Players collect, breed, and battle these 'Legions' in a player versus player environment to earn rewards. The game leverages NFT technology for ownership of Legions and in-game assets, creating a play-to-earn ecosystem. Greenstone represents a specific faction or type within the Crypto Legions universe, likely with unique characteristics and abilities.