You can create a map change that encompasses the entire map, switching all terrain tiles to a different state (e.g., changing from a normal map to a "burning" map version). Open in FEBuilderGBA. Define a new Map Change ID.
// Example of a map change covering an area TILECHANGE 0x01 // Changes tiles based on ID 1 defined in map data Use code with caution. Troubleshooting Map Coverage Issues