The Reverse Side of the World (世界の裏側, Sekai no Uragawa?) is the layer of the World that retains the laws of the Age of Gods, housing surviving Phantasmal Species and presumably Divine Spirits instead of people. The world where humans currently live employing the laws of physics is like a fabric that thinly extends across the surface of the planet, and underneath this fabric exists the Reverse Side of the World, where supernatural beings have retreated to after the Age of Gods ended. Finally, beneath that fabric exists the planet known as "Earth". In other words, the Earth is the bottom layer of the planet, and it is covered by the “Reverse Side of the World” — the place where the laws of the "World" as it once was reigns, and covering that is the "Present World" where humans of the Age of Man live.
Rhongomyniad is one of the "anchors" that fasten the planet together to ensure that the world of humans on the outermost layer of the world can't be destroyed by those on the Reverse Side who wish to reenact the Age of Gods. The Holy Spear that King Arthur holds is nothing more than a shadow of the main body: a tower that fastens together the skin of the world. It exists to be the planet's anchor and to ensure the World's stability.
In Fate/Apocrypha, Sieg in his Fafnir dragon form migrates the Greater Grail to the Reverse Side of the World. In the Reverse Side of the World, the Holy Grail cannot activate Amakusa Shirou Tokisada's wish of "Salvation of mankind through the Third Magic" simply because no humans exist there. Reaching the Reverse Side of the World as a Heroic Spirit is not impossible because Heroic Spirits have already become inhuman the moment they died; however, the probability is incredibly close to zero. In order to reach the Reverse Side to reunite with Sieg, Jeanne d’Arc essentially tried an infinite number of times from the Throne of Heroes, which was removed from the time axis. Manaka Sajyou encounters Sieg when she sends her consciousness through the "Reverse Side of the World" in Fate/Labyrinth.
Avalon (アヴァロン, Avaron?) is the paradise in the Arthurian legends, existing in the Reverse Side of the World at the same coordinates as Britain. It is a small world that was called the Land of the Eternal Spring and the Island of Apples in mythology, the utopia was thought to be derived from the island that produced the "Apple of Immortality" in Greek mythology. King Arthur and Francis Drake are said to dwell in Avalon, the city of the dead, and will eventually return to lead England to true glory.
It is a Utopia that may not be granted to beasts which possess wisdom, one that may never be reached. It is a world cut off from the constant decay and destruction of the surface of the planet and, although it is nestled in human history, has no connection to other lands at all. Daytime is filled with spring’s sunshine and the smell of summer; night is wrapped in the autumn air and stars of winter. It is where flowers of all colours bloom on gently sloping plains. A forest can be clearly seen in the far distance, enveloped by the overlooking sky; the view is evenly divided between the sky and the earth. There is no sign of human civilization in the lands. On earth there are countless flowers and bugs; in the forest there is water and green, and ethereally beautiful fairies lurk in the pond. The paradise people imagine is only an imitation of this place. Here, in this un-trodden place, the bounds of a tabooed land (禁足地, kinsoku-chi?) serve as the ends of the island. Though the island has no end, it seems to change like any other land. Further into the island the land turns barren, similar to Britain. It is where fairies got up and went to after the Age of Gods ended.
According to Merlin, the density of magical energy in Avalon is too strong. He thought it should not be called a paradise, but it could be better utilized as a weapon instead. He compares the place to a vacuum, simply breathing in it is enough to end up dead. In one breath a human of the current age would burst from inside out.
Once Artoria Pendragon terminated her contract with the World by destroying the Holy Grail by her own will, she goes to Avalon. In the Last Episode, Shirou Emiya was able to reach Avalon and reunite with Artoria.
- ↑ 1.0 1.1
 Fate/Apocrypha material - Encyclopedia: Other Side of the World [Others], p.173 [T]
Reverse Side of the World [Others]
The place where the evil dragon Fafnir finally arrived at the very end of the novels. The Phantasmal Races, having understood that the Age of the Gods was over, ceded the Earth’s surface to humans and moved to this place. The world where humans currently live (including the laws of physics) is like a fabric that thinly extends across the surface of the planet. Beneath that fabric exist the planet known as “Earth”. On the other hand, the Reverse Side of the World is the world as it was before humans lived there… that is, the fabric of the era where Phantasmal Races strode the land. In other words, the Earth is the bottommost layer of the planet, and it is covered by the “Reverse Side of the World”—the place where the laws of the “world” as it once was reigns, and covering that is the “Present World”.
In the Reverse Side of the World, the Holy Grail cannot activate its function of “using the Third Sorcery”. In the first place, that function was for the sake of granting Shirou Kotomine’s wish. In other words, it is programmed to target humans, and doesn’t count Phantasmal Races as valid targets.
Jeanne d’Arc is a Heroic Spirit who, from the start, lost her human body long ago. Because of that, the chances of her reaching the Reverse Side weren’t completely zero… However, that is merely the kind of “not zero” like, as a comparison, somehow managing to pass through a wall with the tunnel effect, but the Throne where Heroic Spirits Exist is cut off from the time axis, so she effectively had an infinite number of attempts to try.
- ↑ Garden of Avalon - Chapter 02: The light of the stars, p.040-052
- ↑ Fate/Grand Order - Altria Pendragon (Alter - Lancer), Translation by Master of Chaos
 Fate/side material - Encyclopedia: The Everdistant Utopia [Noble Phantasm], p.063 [T]
The Everdistant Utopia [Noble Phantasm]
The paradise in the Arthurian legends; a scabbard bearing the name of the Faerie Land.
The utopia Avalon was thought to be derived from the island that produced the "Apple of Immortality" in Greek mythology.
Avalon mended all wounds and halted the wielder's aging process. After unleashing its true name, Avalon would break into hundreds of shards and shield the wielder from all interference.
The sheath of the holy sword was excavated by the Einzberns from Cornwall. It was given to Kiritsugu as a catalyst to summon King Arthur.
It was a Noble Phantasm reaching the realm of True Magic. Avalon shut out all physical interference, operation of parallel worlds, and multi-dimensional communication (up to the sixth dimension).
If Saber went hikikomori, no one would reach her.
 Fate/Extra - Francis Drake (Rider) Matrix [T]
Master: Shinji Matou
True Name: Francis Drake
Noble Phantasm: Hunt of the Golden Hind: Golden Stag and the Eventide Tempest
Keyword: Invincible Armada, Logbook
Strength: D, Defense: C, Agility: B, Magic: E, Luck: EX
Anti-Magic: D, Rider on the Storm: A+, Settler of the Stars: EX
01 - Hunt of the Golden Hind: Golden Stag and the Eventide Tempest
This Noble Phantasm is Rider's ace in the hole and forms the basis of her day-to-day life. With her flagship, The Golden Hind, at the fore, a vast flotilla of smaller craft expand ever outward and exterminates her enemies with overwhelming firepower. Its attributes contain vestiges of not only the fleet that eventually defeated the mighty Spanish Armada, but also of the stories involving the golden stag and the eventide tempest that had spread throughout the whole of Europe.
The eventide tempest is the encapsulation of all storms, from blizzards to cyclones, which manifest in the imagination of men as beasts and soldiers, saviors and monsters. Depending on who is speaking, the leader of these apparitions ranges from a fallen King Arthur to the Norse god Odin to the first murderer of men, Cain. in England, it is believed that Francis Drake rides the endless storm despite the fact that the role assigned to her is usually given to malevolent figures of history and myth.
02 - Invincible Armada
The name given to the Spanish naval forces during the period of history known as the Age of Discovery.
The Invincible Armada consisted of an estimated 65,000 men serving on more than a hundred large warships, each of which weighed in at over 1,000 tons. Its might was such that it earned Spain the reputation of being "The kingdom on which the sun will never set."
03 - Logbook
The sailing logs of a renowned explorer who successfully circumnavigated the globe.
The logs themselves are illegible, with pages cracked and flaking. However, it seems that the author of these logs was a ship's captain who made their name as both an adventurer and fleet commander.
０１ - 黄金鹿と嵐の夜
０２ - 無敵艦隊
０３ - 航海日誌
Cancels single-action spells.
It also bestows magical resistance equal to that normally provided by a physical talisman such as an amulet.
Rider on the Storm [A+]
Talent that lets one sail objects recognized as ships.
As the ability to lead is essential in her position, this unique skill also has an effect on Charisma and Military Tactics.
Settler of the Stars [EX]
This unique ability is given to those heroes whose exploits became turning points in human history.
Any difficult voyage and insurmountable challenge cease to be "impossible" and became "events to be realized."
01 - Character Background
The person who circumnavigated the globe and paved the way for England to become the dominate superpower in the Age of Discovery through its substantial earnings. This person was also the one who was given credit for the virtual destruction of Spain's Invincible Armada, which caused the nation once thought of as "the kingdom on which the sun will never set" to teeter on the edge of collapse.
She is a person who has dedicated her life to hedonistic pursuits and sees no difference between a paragon of virtue and a rogue scoundrel. She revels in all things gaudy, whether they are in war or in her private life, and is content to chase after ephemeral pleasures and leave nothing of worth behind, much like the passing of a raging storm.
She is particularly entranced with treasures of gold and silver, but her true love lies not with enduring treasure, but those treasures that explode like fireworks and then quickly fade away.
As she so often declares, "I chase after gold so that I can scatter it like a storm!"
It is for this reason that she is wholly incompatible with the Hero of Legend that symbolizes "an inexhaustible treasury." She would also be at odds with the fox-eared Caster, as Caster is the epitome of eternity.
As a devoted libertine, all that matters to her is the inevitable crash at the end of it all. A Legendary Spirit who is completely indifferent to the frailty of human existence, she is content to indulge in her own whims and desires until death comes to greet her.
She died of dysentery at the age of 55. Her dying wish was that she be buried in her full armor.
02 - "Franciscus Draco"
Sir Francis Drake is generally considered the first person to successfully circumnavigate the globe (the first person known to have attempted this feat -- Ferdinand Magellan -- was killed halfway through his voyage).
Though a male in life, Francis Drake has materialized in Fate/Extra as a woman.
During the time of Francis Drake, England was considered to be a second-rate power with no real influence beyond its borders and no colonies of worth overseas. It was primarily due to his voyages and successes on the high seas that gave rise to the British Empire. The combination of the wealth he brought to the country and the detailed maps he produced while circumnavigating the globe allowed Britain to assemble a fleet that rivaled that of Spain's.
An oft-mentioned aspect of the Drake mythos is that of his ship, the Golden Hind. Not only was it the flagship of Drake's fleet, it was seen as a symbol of hope and a source of miracles. The exploits the Golden Hind made possible elevated Drake (known and feared by the Spanish as El Draque) to a level on par with King Arthur. Both are said to dwell in Avalon and "across the ocean", the city of the dead, and will eventually return to lead England to true glory.
During what was to be the final confrontation between England and Spain's Invincible Armada, Francis Drake was commissioned as a vice admiral in the English navy. Using an unorthodox strategy involving the use of fire-ships, he forced the Spanish fleet into open water where they could be bombarded with cannon fire.
In addition - and this is merely literary creation - there is also a story full of romance in which Drake was a companion of Queen Elizabeth and, just before setting sail for the world circumnavigation, switched places with the Queen, who could no longer go out in public due to receiving a wound on her face.
０１ - 人物背景：
０２ - 『悪魔』