The GM is responsible for everything else, including:

• The world, the terrain, the weather
• Monsters and hazards
• Non-player characters (NPCs),
• What happened before the PCs got here
• What happens after they leave

The GM will ask for input and ideas. They'll ask you to make up details about the world that your PC would know. But ultimately, the world beyond the PCs is the GM's domain. The GM describes how the world reacts to the PCs' actions, and they curate what is and isn't true about the world at large.