Gavin Cliggett developed a new multiplayer scenario, Battle for Treasure Island, for the qwrtln/Homm3BG-mission-book repository, focusing on content development and game design. He created detailed SVG map assets and authored a comprehensive LaTeX document outlining rules, setup, and victory conditions for two to six players. The scenario features defined map tile arrangements, starting resources, unit allocations, and timed events, all designed to support repeatable, balanced gameplay. Gavin ensured all changes were fully documented and traceable through version control, providing a foundation for future expansions. His work demonstrated depth in scenario creation and technical documentation using LaTeX and SVG.