On How to Resist the Invasion of Other Worlds

The world we live in is just one of countless worlds in the universe. Among the many worlds are the world of cultivation, the world of martial arts, the world of weirdness, the world of fighting spirit, the world of magic, the world of mythology... When a world's resources are insufficient to support its development, troubled times begin and strife begins. So how to prevent the invasion of other worlds? Of course, destroy it before it invades!