The Mike Shea RPG Reference Return of the Lazy Dungeon Master EX is a game product published by Sly Flourish in 2018. It is specifically designed for use in the Dungeons & Dragons role-playing game, catering to players looking for tips, tools, and resources to enhance their gaming experience. This book serves as a valuable companion for Dungeon Masters looking to streamline their preparation and make the game more engaging for their players.