The "Realms Invisible" are the parts of the Fallen World that are separated from the Realms Supernal by the Abyss, but are clearly supernatural in origin and under normal circumstances inaccessible for Sleepers. Mages with the Spirit, Death and Mind Arcana are able to interact with their corresponding Realm.
Such realms include:
- The Astral Space
- The Twilight
- The Gauntlet
- The Shadow
Some scholars classify the Underworld and the Inferno as other Realms Invisible.