Demonwall

The Demonwall was made during the First Age and retains its power during the Second Age.

Appearance
The Demonwall was, at its creation, a giant white wall that separated the Old Empire from Môsôoriku, though neither was known by those names at that time. Due to the Watchman interfering in the business of the Old Empire, the Free Cities sprang up, making their homes in the Demonwall. After Hazet was defeated by Gilgamesh, a portion of the Demonwall near the Northern Sea crumbled, killing many.

Demon, Begone! (Passive) (2)
The Demonwall prevents demons of any kind from entering or passing the area in which it stands.