Separating The Shadowlands from the deeper Underworld is the mystic storm called the Tempest. The Tempest is a perpetually swirling maelstrom of energy, memories and Spectres issuing from the Labyrinth and continuously raining plasm and materials on both The Shadowlands and Dark Kingdoms. The Tempest is generally weaker in The Shadowlands, although this changes when a Maelstrom occurs.
Roads, called Byways, travel through the Tempest; Wraith skilled in Argos can travel without a Byway.