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A Domino Revelation occurs when the revelation of a previously hidden truth leads to another revelation, then another, like the knocking over of dominoes.
Often evoked in fantasy works, where the revelation that one mythological or legendary species exists leads to finding out that many more also do, and works featuring conspiracy theories, where finding the shadowy figures behind a seemingly minor crime opens up a vista of sinister plots all emanating from the same source. In romance, one confession can often lead the way to one or several more.
It gets a good bit of use in Urban Fantasy and Steam Punk works as well.
All Myths Are True is a common end result when all dominoes have fallen. May overlap with The Masquerade or The Conspiracy where the protagonist is introduced to their secrets.
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Anime and Manga
Puella Magi Madoka Magica does this with Awful Truths. In the wake of Mami's death, Kyouko's appearance shows that few magical girls are as altruistic as Mami was. This leads to Sayaka's confrontation with Kyouko on the bridge, where it's revealed that Soul Gems literally contain the soul of a magical girl. This, in turn, leads Sayaka to fall into despair, corrupting her Soul Gem and revealing that a corrupted Soul Gem doesn't break or disappear, but instead turns into a Grief Seed, a revelation which prompts Kyubey to explain to Madoka the true nature of the magical girl system. Additionally, the process of Sayaka falling into despair leads to a chain of events resulting in the revelation that Homura has some form of time travel/timeline changing ability. Basically, the revelations show piece-by-piece how the inner workings of the fairly cliche-looking premise are actually terrible, terrible things.
Werewolf by Night: Werewolves aren't the only supernatural thing out there, weretigers, vampire, demons, and other superheroes!
Legion of Super Heroes: In the Earthwar Saga storyline, the attacks on Earth by the Resource Raiders turns out to be the advance guard of an attack by the Klingonesque Khunds. Whose leader is secretly being controlled by the shadowy Dark Circle. Who are secretly being commanded by Evil Sorcerer Mordru.
Charmed: First we learn of witches and demons, then angels, spirits, fairies, and a whole mess of critters come crawling/teleporting/orbing/shimmering out of the woodwork.
Fringe: Similar to The X-Files with aliens, mind control, and other weird things being revealed.
Lost Girl: All supernatural creatures exist, some are True Fae others just call themselves fae and are in fact Succubi, Spirits, Werewolves, and all manner of other magical creatures.
Supernatural: Dean and Sam are hunters. They fight demons, astral creations, angry angels, pagan gods, ghosts, etc.
The X-Files: Earliest TV example of this trope; from Monsterof The Week to aliens in the basement with werewolves, wild men, demonic beings, and eventually Body Horror and evil spirits... this series had it all.
True Blood: Vampires first, shapeshifters, then goddesses, werewolves, fae, werepanthers, and witches.
The Vampire Diaries: Again vampires first then we learn that witches and werewolves also exist.
My Babysitter's a Vampire: The main characters have a babysitter that is a vampire. They also find out that one of them can see the future and that witches exist.
Persona: Well, it's more Fantasy Kitchen Sink at times. Spirits (demons in Japanese) exist, but that's merely the catch-all term for supernaturals. And they ALL are very real projections of one's psyche.