What does it mean when a region is described as "Dangerous"?

What does it mean when a region is described as "Dangerous"? - Man Wearing White Dress Shirt With Black Necktie

On the world map, when selecting a stage, some stages are marked with a monster claw and described as "Dangerous". What does this mean? What manner of horrors - and accompanying rewards! - await me in such areas?

Dangerous!






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What does it mean when a region is described as "Dangerous"? - Ocean Waves at Sunset
What does it mean when a region is described as "Dangerous"? - Bench with roof near stony formations and hills in Cappadocia
What does it mean when a region is described as "Dangerous"? - Nazar amulets on threads hanging from tree branches near rocky uneven formations with mountains and grass with plants in Turkey in Cappadocia region under gray cloudy sky in summer day





Apparatuses of arrogance in the region have defined dangerous goals for themselves - Leader




Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.

Images: Craig Adderley, Rodrigo Burgos S., Meruyert Gonullu, Meruyert Gonullu