Multiverse

Not to be confused with Timelines.
The Multiverse is the total sum of all universes in the greater omniverse, these parallel universes coexist alongside one another inside their own pocket of reality, with each new universe being born from the inevitable heat death of another. 
==Designations==
* The Nihil - Not technically a universe, The Nihil comprises of the the void of anti-space that exists outside the universes.
* D-242 - The mainline The Placebo Effect universe, this universe is initially identical to the real world with some minor differences and alterations, most notably the 1997 quantum displacement event and the 2001 financial crisis, however, widespread political and civil turmoil emerging as the result of the 2018 New York City Crisis leads to greater deviation in the 2020s. 
** Blank Earth, Crestfallen, Holmes, The Lost World, The Melancholy of Separation, Neurotic Atrophy, Of Cigarettes & Copulation, One Cold Night, One More Night, One Warm Night, The Rain of April, Smoking the Filter, Snow In Summer, Under The Stars, Uneven Odds, and partially, The Winters of Cascadia, occur in this universe.
* D-419 - The home universe of the galactic system of Cascadia-B419, a libertarian-syndicalist society spanning multiple planets, Earth does not exist in this universe.
** The Winters of Cascadia occurs partially in this universe.
* D-541 - The home universe of the Kingdom of Cascadia, Earth does not exist in this universe.
** The Winters of Cascadia occurs partially in this universe.
* D-788 - The home universe of Alma Industries, a biotechnology corporation responsible for the de-extinction of dinosaurs intended as zoonotic attractions. Due to a quantum displacement event in 2037, the Alma Headquarters and their living exhibitions are incidentally transported to the Amazon rainforest of D-242 in early 1997. 
* D-913 - A variant universe of 242 invaded by the Nephilim from The Nihil in an event referred to as The Apocalypse, this universe deviates extensively from the others September 13th, 2010.
** Apocalypse and Reawakening occur in this universe.
* D-981 - A variant universe where John Roxton is killed prior to the events of Uneven Odds. As a result, the biological weapon (later christened as LYVID-94) is accidentally released, causing a widespread epidemic that kills tens of millions and cripples the United States of America. 
** Farewell Abodes and Fragmented Ambrosia occur in this universe.