Video Flythrough: https://www.youtube.com/watch?v=cIz3PMQsRIw

This arctic mountain environment has a highly realistic landscape featuring several types of Aurora Borealis level. Landscape terrain using detailed shaders and a variety of assets covering the mountain. Ranging from high level trees both snowed in and dead branches to small sapling trees with clusters of snow chunks and deposits of snow. A variety of mountain ranges are scattered across to add depth and life to the scene. A background layer of mountain allows the viewer to feel the distance and overall scale of the time. On top of that realistic particles featuring rolling snow clouds over the mountain peaks and shooting stars, you can really the authenticity of the scene.

Note: The scenes use physically accurate lighting values which is why the sun intensity makes it so overblown. You need use or add a cinecamera and tweak the ISO and shutter speed values. You also need to ensure you have enabled ue4 extend default luminance range in the project settings.