Miasma

The Miasma is a colossal sheet of dark clouds that chokes access to the northern hemisphere. The weather from the Miasma - whether that's black rain, snow, or lightning - is cursed, withering away anything it touches. However, it is also responsible for an abundance of monsters in the waters to the north, as well as those found on the island of L'Empieta. The Sylvestrian Vigil keeps these monsters at bay.

The root cause of the Miasma is not known. However, scant records have discovered that the Miasma existed prior to the Cascade. The exact mechanics of the Miasma's weather are not known, and tests made to discern it are incredibly risky. The Miasma manifests in the Emerald Sea and the Black Bog in the same locations as it appears on the Waking World.

Because of this combination of traits, the Miasma is currently considered impassable.