The North is a lot like the Underworld. It is dark a lot of the time especially in winter. The moon shines over the north for months. The north was a stronghold of the Lunars just as the south was a stronghold of the Solars and has a disproportionate number of Lunar manses. The Chosen of the Moon were drawn to this shadowy and eldrich land.
   In shadowlands the ground is covered in the ashes of the dead. A shadowland is created when the land is completely a realm of death. Shadowlands often occur in graveyards and other places where death has dominated Creation and became the only thing present there the Essence of the Underworld spills through it. Graveyards are often surrounded by iron fences to stop the dead from escaping and are carefully warded.

Fear of the Dark

    The vessel is an actual ghost ship the ghost of the god of a ship that sank and rotten at the bottom of the sea. The ship long since vanished but in the unlit depths of the ocean
   When there is no sun they can pass between Creation and the Underworld which is permanently beyond the Sun's gaze. The Unconquered Sun doesn't just shine down on Creation he sees everything his light falls upon. The deep ocean is pitch black and often home to a myriad of horrors that at night rise up and walk upon Creation's shores. Such places as the darkest forests and the deeps of caves act as haunts where the things that cannot live under the Unconquered Sun's light lurk within Creation. In these places the boundary between Creation and the Underworld is blurred for there is no difference between day and night and ghosts can pass easily from one world to the other with the right Arcanos. Such is the instability that the deaths of the Primordials wracked upon reality. In the dark northern winter ghosts can walk freely for months at a time. The further north you go, not only does it get colder as the days get shorter, but ghosts can stay for longer in Creation.
   Around the Pole of Fire the sky is blanketed by and endless cloud of smoke.