One of the lighting variations on Koboh is nighttime. I was in charge of creating the skydome for it.
I was also responsible for creating a cloudscape when players decided to explore the top of the mountain at this time.
I use several cloud cards generated from Terragen. Using the crossfade scrolling and the depth fade shader feature in UE4, I was able to create a convincing moving cloudscape in the vista.
The end result is massive teamwork done by many talented artists. Here are some of the artists who are also involved in creating this environment:
Concept - Bruno Werneck
Skybox - Hanhee Lee
Lighting - Rob Simpson
Environment - David Brumbley /Connor McCampbell / Bryce Houska
And many more...