Melee in Moonstone is simple: you can attack an enemy within your melee range. You draw your Melee stats + modifier in cards, then the enemy player does. Each melee card represents a combat maneuver and lists how it interacts with every other combat maneuver as well as tags like "Piercing." You and the opponent reveal cards at the same time and resolve the damage, if any. It's very good and verisimilitudeous - a lot more than any game that resolves melee with mere dice rolls could ever be.
