The Eye of Terror, called the Ocularis Terribus in High Gothic, is a massive Warp rift and permanent Warp storm approximately twenty thousand light years across, a nexus of psychic energy and physical space-time where the Immaterium co-exists with real-space.
It is the largest and most well-known Warp rift in the Milky Way Galaxy and is located at the rimward edge of the galaxy, to the galactic northwest of Terra, in the Segmentum Obscurus.
It is home to the largest concentration of the forces of Chaos in realspace, including the Traitor Legions of Chaos Space Marines that fled from Terra after the end of the Horus Heresy.
