The Shadowlands

"For months, brave heroes, you have been waging war against the malevolence that plagues your homeland valiantly. Nothing is impossible with the wealth of powerful weapons and skills you have amassed through relentless training and combat experience - not even the Martian invasions, or even the Primeval Golem. But as you strike back against the darkness that creeps ever so ominously across the world, there surely remains just one lingering thought in your minds - where do they come from?"

- Shadowlands Lore

Shadowlands is the realm of almost-complete total darkness, and never-ending light.