Fallen Angel—Believed to be evil by most humans, fallen angels can be grouped into two categories: True Fallen and Unfallen. Unfallen angels have been cast from Heaven and are earthbound and wingless, living a life in which they are neither truly good nor truly evil. In this state, they can, rarely, earn their way back into Heaven. Or they can choose to enter Sheoul, the demon realm, in order to complete their fall, grow new wings, and become True Fallens, taking their places as demons at Satan’s side.
Harrowgate—Vertical portals, invisible to humans, which demons use to travel between locations on Earth and Sheoul. A very few beings can summon their own personal Harrowgates.
Memitim—Earthbound angels assigned to protect important humans called Primori. Memitim remain earthbound until they complete their duties, at which time they Ascend, earning their wings and entry into Heaven. See: Primori
Primori—Humans and demons whose lives are fated to affect the world in some crucial way.
Radiant—The most powerful class of Heavenly angel in existence, save Metatron. Unlike other angels, Radiants can wield unlimited power in all realms and can travel freely through Sheoul, with very few exceptions. The designation is awarded to only one angel at a time. Two can never exist simultaneously, and they cannot be destroyed except by God or Satan. The fallen angel equivalent is called a Shadow Angel. See: Shadow Angel
Shadow Angel—The most powerful class of fallen angel in existence, save Satan and Lucifer. Unlike other fallen angels, Shadow Angels can wield unlimited power in all realms, and they possess the ability to gain entrance into Heaven. The designation is awarded to only one angel at a time, and they can never exist without their equivalent, a Radiant. Shadow Angels cannot be destroyed except by God or Satan. The Heavenly angel equivalent is called a Radiant. See: Radiant.
Sheoul—Demon realm. Located on its own plane deep in the bowels of the Earth, accessible to most only by Harrowgates and hellmouths.
Sheoul-gra—A holding tank for demon souls. A realm that exists independently of Sheoul, it is overseen by Azagoth, also known as the Grim Reaper. Within Sheoul-gra is the Inner Sanctum, where demon souls go to be kept in torturous limbo until they can be reborn.
Sheoulic—Universal demon language spoken by all, although many species also speak their own language.
Shrowd—When angels travel through time, they exist within an impenetrable bubble known as a shrowd. While in the shrowd, angels are invisible and cannot interact with anyone—human, demon, or angel—outside the shrowd. Breaking out of the shrowd is a serious transgression that can, and has, resulted in execution.
Ter’taceo—Demons who can pass as human, either because their species is naturally human in appearance, or because they can shapeshift into human form.
Watchers—Individuals assigned to keep an eye on the Four Horsemen. As part of the agreement forged during the original negotiations between angels and demons that led to Ares, Reseph, Limos, and Thanatos being cursed to spearhead the Apocalypse, one Watcher is an angel, the other is a fallen angel. Neither Watcher may directly assist any Horseman’s efforts to either start or stop Armageddon, but they can lend a hand behind the scenes. Doing so, however, may have them walking a fine line that, to cross, could prove worse than fatal.