Editing Emperor's Nightmare (section)

===Glossary===
;Dreamers: Nightmares with psychic potential. Not powerful enough to become librarians, but they have a degree of warp sensitivity and are trained by the librarians and psykana to better control their lucid dreams and more clearly understand the portents and prophecies they dream. When lucid dreaming they may explore the warp in a manner not dissimilar to astral projection.
;Dreamwalkers: These are the dreamers who are astrally projecting themselves into the warp. The August Dreamwalkers in Iron are the librarian dreadnoughts that act as dream guides when exploring the warp, even more so than normal librarians do. They spend whole centuries asleep and roaming the warp with their minds before being woken again and called to battle once more.
;Lucid Dreams: These are simply dreams you can control. (The visions of the future, the prophecies that the dreamers sometimes get, are almost entirely OUT of the dreamer's control and just get forced into their mind for them to experience whether they want to or not.)
;Rest: Battle brothers who are unable to sleep may still rest by meditating with their blindfolds. This, along with drug supplements from the apothecaries, keeps the marines surprisingly healthy.
;Sleep: The circadian rhythms of the Nightmares are extremely strange. The exact length of time in the cycle is difficult to predict but most healthy nightmares average about one month of active duty followed by one month of a coma like sleep. They may dream, and may receive prophetic visions occasionally, but for the most part it is a fugue and there is little brain activity.
;Sleepers: A catch-all term for any Nightmare that is not awake.
;Watchers: Wakened marines, preferably ones who have just woken who are unlikely to fall asleep again any time soon. They stand guard over their sleeper and dreamer brothers. Think of them as an honor guard for everyone currently in a coma for whatever reason. Some watchers hide amongst the sleepers and pretend to be asleep themselves while others guard doors and so on. Any marine, pretty much regardless of rank, may be called upon to perform the duties of a watcher at one time or another.