Where are Terror Fiends more commonly found in the Nintendo game Miitopia?

In the Nintendo game Miitopia, terror fiends are more commonly found in New Lumos. This is due to the fact that New Lumos is the final area in the game, and its darker and more challenging nature makes it a suitable breeding ground for these formidable enemies. As players progress through the game and reach this stage, they can expect to encounter more powerful and dangerous terror fiends, adding an intense and thrilling element to the gameplay experience.