The lush jungles of Chult are not just background scenery; they are a character in the story. Heat, rain, and insects wear down the heroes. The survival rules in the Tomb of Annihilation PDF are specific and harsh. DMs need to reference them constantly. How much water does a character need in heavy armor? What happens if they eat the wrong berry? The digital guide provides quick tables for these mechanics. It keeps the survival aspect at the forefront without slowing down the game with page flipping. This attention to environmental detail is what makes the campaign so immersive.