Lex begins a discussion of the first chapter of the Dungeon Master's Guide with an exploration of the core assumptions of the published D&D settings and how you can alter them to create a world that’s truly unique. Lex accompanies this with an introduction to his own homebrew D&D world of Primordia and how he's approached these core assumptions. Finally, Lex talks a bit about his continuing journey in designing the god, pantheons, portfolios and domains of Primordia.