Lore bit after a stupidly long break:
(This one is a bit longer.)

Void walls are massive, encompassing stretches of darkness that surround the border of each realm.
Often positioned at the edge of oceans or frozen continents, the walls are speculated to be where the night sky meets the ground, acting as a “dome” around the realm.
Visiting a wall is perilous, and few ever make it home. Vast oceans, harsh storms and screaming winds are just the first threats.

The wall is accompanied and held up by a stretch of “empty” ice, which stretches into the sky for just under 4 miles. The ice itself is not of the thermo element, and seems
to be a product of the void wall itself leeching into the world.

If somehow you are able to visit one of these grand structures that hold up the night sky, take great caution to not touch the void barrier. It is said it would leech your memories and soul from your body, leaving you a frozen husk.