Exul

A Realm with an atmosphere saturated with Light Magic and Dark Magic, which dramatically alter how light reaches it. The surface is divided into three main zones according to these differing concentrations: the Wild Zone, where perpetual and complete darkness has forced the wildlife to adapt in dangerous ways, the Light Zone, where the perpetual daylight makes the area unlivable except for the most unusual of creatures, and the Civ Zone, the hospitable middle ground where just enough light penetrates the dusk.

Image source: https://artbreeder.com/