Instant Death Cosmology Page

==Introduction==
This page will cover Instant Death's Terminology and Cosmology. The page only covers relevant information about the practicality of cosmology overall.
If any new information is acquired, this page will likely be updated. Any significant changes to this page must first be accepted in a Content Revision Thread, and all additions must have supporting evidence. Also, references are obligated to be added here to make everything transparent and clear.
The series is originally made in Japanese, and all translations on this page will be from official ones. MTL usage is only exception if there are no controversial issues within it.
===Regarding Canonicity===
Nee-chan no Chuunibyo (My Big Sister Live in Fantasy World) and Instant death are confirmed to share the same verse mechanics, setting and canonicity. 
He also mentioned it once again that the plot of the series of instant death is linked Nee-chan no Chuunibyo on Twitter 
And one more supporting evidence for the same setting similarity between both series is Tomochika Dannoura's sister, Chiharu Dannoura appear in Neechan wa Chuunibyou
Lastly, there is an afterword from the author that also explains that both series share the same connection.
In conclusion, it is unadventurous to say that both series share the same setting, consequently both can be used for cosmological resolutenesses.
Differences between Web Novel and Light Novel
There are no divergences regarding the plot between Light Novel and Webnovel, with exception to improvement and better clarification. 
The letter from Author
==Terminology==
===Celestial Foundations===
The Celestial Foundation contains universes/timelines, and thus it can be said the world or the universe itself. Many characters refer to it as “World”.
===Celestial Foundation Eaters===
Celestial Foundation Eaters are a species of cosmic beings that swim through the Celestial Foundation Sea. They are large enough to dwarf entire Celestial Foundations and constantly eat those for nourishment, but also for consumption of knowledge and raw information derived from them.
In most worlds without higher level intelligence, like gods, the inhabitants have no way to perceive Celestial Foundation Eaters. The worlds the Celestial Foundation Eater consumes are immediately destroyed all at once. As for the victims of the digested Celestial Foundation, their existence ends without warning.
Celestial Foundation Eaters behave like fish and resemble fish. They swim around the sea and eat the Celestial Foundations they come across. If they are met with resistance, they will fight, but will run away if they feel they can't win or if it isn't worth the trouble. 
Over the course of eternity, they devoured countless celestial foundations. A small number of Celestial Foundation Eaters awaken to a more advanced level of intelligence. Due to their newly acquired intelligence, they become sentient and self-aware, and find the sea to be boring due to their newfound senses. In order to amuse themselves, the Celestial Foundation Eaters venture into the Celestial Foundation.
A Celestial Foundation Eater infiltrated the Celestial Foundation by creating a vessel to enter the world. There, he took pleasure in creating chaos and raging wars for his entertainment.
==Cosmology==
===Celestial Foundations===
Celestial Foundations is the universe itself. It contains many things that make up the world, including but not limited to Timelines/Parallel Worlds, Alternate Dimension, the Abyss, Pocket Dimensions, etc. 
File:Vessel idk idk.jpg|There are countless of celestial foundations
File:Celestial Foundation.jpg|It is vessel of the world
====Parallel Worlds/Timelines====
The Celestial Foundation is capable of containing multiple space-time continuums (Timelines) simultaneously. Whenever Darian died, his soul was able to travel back in time. Every time he travelled back to the past because of his death, it created an entirely different timeline.
The timelines exist simultaneously, since the main timeline where Darian fled from Yogiri didn't cease to exist, or get rewritten when Darian returned to the past.
In conclusion, this new timeline is created when Darian kills himself in order to get away from Yogiri. However, the action he took in the past did not change the future. It created a new timeline that existed simultaneously with the main timeline, where he had killed himself. This effectively shows that the Celestial Foundation is capable of containing multiple space-times physically at the same time. 
====Countless Parallel Worlds/Timelines====
There are numerous parallel worlds inside the Celestial Foundation.
The UEG noted that man's ability to connect with his parallel world selves is "next to infinite." This "next to infinite" refers to his inability to die so long as his parallel world selves are extant, so we can conclude that the number of parallel worlds containing other versions of himself is close to infinite.
====Random Walk Ability====
It is a power that sends your soul to a parallel world with different possibility whenever the user dies. 
Whenever Lynel dies, his soul will be sent to a parallel universe with different possibilities to ensure his survival.
Later in volume 12, Lynel confirms he has experienced Random Walk countless times. This would imply that he has been sent to countless parallel universes/timelines.
In conclusion, both Lynel's and UEG's statements confirm the existence of countless parallel worlds inside a single Celestial Foundation.
====The Abyss====
Referred to as the “Astral Plane”, The “Spirit World” is a world in a different dimension that contains three spatial dimensional axises and an additional dimension.
It has shown that one of the ways to access higher dimension or in this case, The Abyss is to possess such an ability like The King who is to move freely between the alternate dimension and three-dimensional space (normal world). One can also access it if they are a higher level/higher dimensional being in nature. By tuning with The Abyss, it allows the King: 
#To be able to go anywhere,
#To avoid any attack
#To bypass any defense of lower dimension beings/world.
Additionally, lower dimensional being or normal people (3D) in this case, Those without similar ability like the King will not be able to perceive The Abyss and unable to do anything against them. All of these show how superior higher dimension when compared to the lower dimension.
As a world with three spatial dimensions and an additional dimension, the Abyss has many locations that overlap with three-dimensional space (the normal world), thus allowing the King to operate and interact with three-dimensional space while inside that dimension.
The Abyss is part of Yogiri, and from the above shown that he can control/manipulate the alternate dimension at will, preventing them from doing anything and going anywhere, effective trapping the people within it. 
===The Sea===
The Sea is an infinite space that encompasses all Celestial Foundations. Although the sea contains countless numbers of themm, it is likely that there are infinite numbers of celestial foundations as the sea could theoretically contain an infinite number of them since its size is infinite compared to the countless number of celestial foundations we currently know it holds.
In addition, the foundations are structured in a stacked, abstract vertical hierarchy. The energy flows from the top to bottom, and due to that, one needs a tremendous amount of power to transfer from a lower world to a higher world.
===Higher Universes===
The higher universes are dimensions that exist beyond the Sea. According to UEG, these higher universes are implied to be more higher-dimensional than the Sea. It is also suggested that each higher universe is contained within a larger higher universe, and so on, with each higher universe representing a higher dimension that encompasses lower dimensions and is significantly larger than the previous one. Kouryu (who is nigh-omniscient) implied that this universe-embedding hierarchy is endless.
===Ultimate Ensemble===
The Ultimate Ensemble is the totality of existence, the collectivity of all worlds, including the Sea and the space beyond that (the hierarchy of higher universes). It contains worlds with different fundamental laws each, which are also nested within each other (further confirming the status of the hierarchy of the Higher Universes):
For reference, the kanji used for Ultimate Ensemble in the novel is the same used for when one actually refers to Tegmark's Ultimate Ensemble.
===The End===
Also known as Yogiri's true self, it is the end of all things.
File:Yogiri true form.jpg|It is described as the end of the all things
File:XoZMJ5p.jpg|Fate and Plot are “joke” in front of his existence
An embodiment of nonexistence that overcomes all others, and from which everything returns to after their end/deaths, of which there is nothing beyond, not even Fate and Plot itself, as those are also equally terminated in front of this calamity.
Jnovel translations omitted parts of the quote above, since we can actually see the term "Plot" be used in the LN raws:
Kouryu, an extremely knowledgeable god in regard to the cosmology of the multiverse (and nigh-omniscient), compared Yogiri to a natural limiter of reality, in which it is the inevitable end of the line that puts in check whatever god or entity that tries to destroy all the creation, ensuring its safety and balance, even if indirectly. It is also omnipresent across all the space and time.
==Notes==
Regarding Celestial Foundations and Heavenly Records Names
*The Celestial Foundation, also known as Heavenly Record in its original Japanese version, is a term that refers to a cosmological structure in the series. Upon translation and publication by Jnovel in English, the term was officially rendered as Celestial Foundation. While the latter term is more commonly utilized in verse discussions, it should be noted that Heavenly Record is also a valid designation for the concept in question, as it represents the same object within the narrative context.
Abbreviations
*UEG stands for Ultimate Extermination God; a character in instant death who is nigh-omniscient and an existence that transcends most, if not all, the Gods hierarchically. For more information, visits her profile. Her statements fall under option 3 and can be utilized for cosmological purposes.
Regarding “Higher Universes” name
*In Jnovel translation, it is translated to “Higher Level Universes”
*In Raw version, it is “Higher Universes”
Fate and Plot terms
*In Jnovel translation, the translator, for some reason, omits the term “Plot”
*In Raw version of Web Novel, Light Novel, and Manga, the term “Plot” is evident.
The plot term is separated when Aoi Hayanose describes that fate/destiny, plot, and the like as being a joke to Yogiri's true form.
The terms used above on each scan:
*運命: destiny or fate
*筋書き: synopsis; outline; plot
It should be noted that both terms are used distinguishable in the context. 
==References==
References and shreds of evidence for cosmological purposes will be found here: 
*Thread #1; 2-B Celestial Foundations
*Thread #2; 2-A Sea
*Thread #3; likely Low 1-C Abyss
*Thread #4; 1-B Higher Universes
*AFBW Instant Death Cosmology
References for commonness of both series regarding the plot's setting:
*Twitter from the author and his tweet
*Volume 4 Afterword
*Chiharu Dannoura Appearance
**Volume 1; Chapter 15 from Instant death
**Volume 5; chapter 3 from Nee-Chan
References for visual evidences (Mangas):
*Celestial Foundation – chapter 32
*The End – chapter 26
Category:Explanation Pages
Category:Instant Death