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The Realm of Darkness (闇の世界 Yami no Sekai?) is a realm made up of Darkness in people of every world. As with the Realm of Light, this realm has a Keyblade, Kingdom Key D, which King Mickey had obtained. Kingdom Hearts is found here within it's deepest depths, though it can only be accessed when the Final Keyhole is unsealed. This is also the home of all the Heartless and where the most powerful ones can be found.
Kingdom Hearts Birth by Sleep
In the Final Episode, after Terra-Xehanort turns the Keyblade on himself, he falls into a dark portal leading to the Realm of Darkness. Aqua then dives in and sacrifices her Keyblade and armor to save Terra-Xehanort. However, Aqua herself is now trapped in the Dark Realm.
Between Kingdom Hearts Birth by Sleep and Kingdom Hearts
Ansem the Wise, betrayed by his apprentices, was banished into the Realm of Darkness, a realm he calls the realm of nothingness in his reports, due to nothing existing there save for the darkness. While he is in this realm, he learns to use the power of darkness to exact his revenge, but does not allow the darkness to control him as it has controlled his beloved apprentices.
After the battle on End of the World's recreation of Destiny Islands, Ansem, Seeker of Darkness transports Sora, Donald and Goofy to the endless abyss, where the Door To Darkness resides. This is the closest Sora had gotten to the Realm of Darkness until Kingdom Hearts II.
Kingdom Hearts II
In Kingdom Hearts II, Sora, Donald, and Goofy visit the Realm of Darkness after being saved from Saïx by Maleficent in Radiant Garden, where they encounter a man in a black coat, later revealed to be Riku. Riku leaves behind a box with a picture of Hayner, Pence, Olette, and Roxas and a bar of sea-salt ice cream. In this same realm, the Keyblade reacts to the ice-cream and Sora opens a Gate, that leads them back in their Gummi Ship to revisit all the worlds they had previously been to deal with new problems plaguing them.
Also, after defeating Xemnas, Sora and Riku end up on the edge of the Realm of Darkness, at a beach. There, a letter from Kairi allows Sora to open the Door to Light, returning him and Riku home.
In Kingdom Hearts Birth by Sleep's secret ending, Aqua finds Ansem the Wise sitting on the Dark Margin on the side of darkness. The scene takes place some time after the Kingdom Hearts Encoder exploded in Kingdom Hearts II. Instead of killing him, the machine's explosion transported Ansem to the dark realm and caused him to slowly lose his memory.
Aqua and Ansem the Wise have a conversation about the worlds and how Ansem came to know Sora. This leads Aqua to shed tears of hope, knowing that he would save her and her friends.
Kingdom Hearts 3D: Dream Drop Distance
After having defeated the Anti Black Coat and having reappeared in The World that Never Was, Riku is contacted by Ansem, who opens a portal of Darkness in order to bring Riku into the Realm of Darkness.
Kingdom Hearts Birth by Sleep Final Mix
Realm of Darkness
The titular Realm of Darkness (referred as that in the game data) is first seen in Blank Points as the pathway that Aqua follows while lost in the darkness. Here, she encounters a numbers of Darksides. While she is about to give up and let herself be swallowed by the darkness, Terra's and Ventus' Keyblade, the Earthshaker and Wayward Wind rescue her before vanishing, renewing her hopes.
Realm of Darkness: Middle Zone
The Middle Zone is an open area coming right at the end of the pathway. The area is filled with stairs-like terrain, high cliffs, and strange column-like structure with glowing blue marks. There are also strange orbs of darkness that, when approached, will push Aqua away, and are useful for reaching higher areas by jumping on them. It is in this area where the player first encounter the Heartless.
Realm of Darkness: Lower Zone
The Lower Zone is a maze-like area, with countless cliffs and twisted pathways populating this zone. In order to advance through here, it is necessary to make good use of the dark orbs that push you away. There are zones where the pathway is vanished, and just noticeable for a subtle purple glow. For the path to appear, Aqua must defeat the Heartless that spawn near them.
Realm of Darkness: Upper Zone
The Upper Zone consist of various hovering platforms surrounded by twisted, glowing structures. Should Aqua fall in the pits below, she will return to the Lower Zone. The Heartless in this place only spawn once in the places where the ground is purple.
Valley of Darkness
The Valley of Darkness is an open space in the Realm of Darkness. It seems to be covered by a thick mist, and surrounded by twisted, dark trees in the background. It is here that Aqua is attacked by the Hunter of the Dark and engages in a fight with the Heartless. A mysterious vortex is seen in the background, surrounded by dark thorns.
Darkness's Call is a location inside the Realm of Darkness. It has two areas, a sky of darkness, and a valley with dark rocks.
In Kingdom Hearts 3D: Dream Drop Distance, Ansem brings Riku here in an attempt to get Riku to embrace his darkness.
Kingdom Hearts II
Corridor of Darkness
Corridors of Darkness are unpredictable pathways that interlink the worlds in the Kingdom Hearts universe. The Heartless use these extensively to reach other worlds, as do members of Organization XIII, their subordinate Nobodies, and many other characters. These pathways are formed out of Darkness, so it is unsafe for a normal person to travel them, because the constant use of these corridors would slowly corrupt one's heart. One upside to the Darkness in the Corridors is that it provides a faster means of travel than the Gummi Ships.
However, the Heartless, the Nobodies, and the Princesses of Heart don't have to worry about this, since the Heartless already have corrupted hearts, the Nobodies do not have hearts to corrupt, and the Princesses of Heart have hearts made out of pure light. An example of the Princesses of Heart's immunity would be, when Axel was kidnapping Kairi - he took her through a Corridor of Darkness. Kairi was wearing normal clothes, yet she wasn't affected by the Darkness, as her heart was made out of pure light. According to Nomura in the Director's Secret Report XIII, Riku and Mickey also aren't affected by the darkness at all, due to some "secret similarities".
Other characters who have used these corridors include Sora, Donald Duck, Goofy, King Mickey, Kairi, Riku, Naminé, DiZ, Beast, and even Pluto. Of these, only Riku, Naminé and DiZ have been responsible for summoning the portals.
Ironically, in the first Kingdom Hearts, after the face-off in Neverland, Riku's heart was significantly weakened as he carelessly used a Corridor of Darkness to return to Hollow Bastion. Nomura goes further to state that DiZ and the Beast can successfully use the Corridors of Darkness, and perhaps open them, due to their particularly strong feelings. Furthermore, despite Sora having used the Corridors of Darkness several times before, he has not used them frequently enough to allow the Darkness to stain his heart. The influential power of Darkness depends on the strength of a person's heart.
Anyone who has traveled in darkness for too long would show a few physical traits: their skin darkens and their eyes turn amber. This is especially true for Xehanort, the vessel that make his Thirteen Darknesses both have tan skin and amber eyes. In the case of Ansem the Wise as he only has amber eyes.
Maleficent is also believed to travel the Corridors, though she does not show the physical changes. This could be due to her trying to command the Darkness, instead of becoming one with it. It is also known that Pete travels the Corridors as well. He is known to be protected from the Darkness by Maleficent's magic.
The Black Coats worn by Riku, King Mickey, and Organization XIII are said to protect wearers from the effects of darkness, and from detection by those who use darkness. Thus, those who wear these coats can traverse Corridors of Darkness without suffering the negative effects.
The Dark Margin (referred to by Tetsuya Nomura as the Dark Coastline) is a mysterious place in Kingdom Hearts. It is first seen in the "Another side, Another story [deep dive]" FMV.
In Kingdom Hearts II and in Kingdom Hearts 358/2 Days, Roxas converses with Xemnas at the Dark Margin. He talks to Roxas, telling him how much he looks like Sora.
It reappears in the end of Kingdom Hearts II. After defeating Xemnas, Riku and Sora end up at the Dark Margin. Suddenly, after Sora reads a letter from Kairi, a door appears, leading them to Destiny Islands.
The Dark Margin is also seen in the secret ending of Birth By Sleep, Blank Points. Taking place after Kingdom Hearts II, Aqua finds Ansem the Wise here and is curious where he came from. Upon further discussion, he tells her about a keyblade wielding boy who has saved the worlds from darkness on multiple occasions. When she asks his name, Namine, Axel, Roxas, Xion, Terra, Ventus, and Ansem the Wise are all shown saying Sora's name with a renewed sense of hope.
According to Another Report, Nomura states that the Dark Margin is "the tip of a world", i.e. the boundary between Darkness and In Between. Sora and Riku were on the coast of the side of In Between, and were looking over the sea in the Realm of Darkness. Having said this, the Door to Light which appeared in the ending scene is reminiscent of a theme which recurs in the Kingdom Hearts series: "No matter how deep the Darkness, a light shines within".
|Sora - Donald Duck - Goofy|
Tarzan - Aladdin - Ariel - Jack Skellington - Peter Pan - Beast
|Simba - Genie - Dumbo - Bambi - Tinker Bell - Mushu|
|Ansem - Maleficent - Riku - Hades - Jafar - Captain Hook - Oogie Boogie - Ursula - Clayton|
|99 Puppies - Abu - Aerith - Alice - Aurora - Bathtub - Belle - Brooms - Card Soldiers - Carpet - Cave of Wonders Guardian - Cerberus - Chernabog - Cheshire Cat - Chip and Dale - Cid - Cinderella - Cloud - Crocodile - Daisy Duck - Doorknob - Dr. Finkelstein - Eeyore - Fairy Godmother - Flotsam and Jetsam - Flounder - Geppetto - Glut - Hercules - Huey, Dewey, and Louie - Iago - Ice Titan - Jane - Jasmine - Jiminy Cricket - Kairi - Kairi's Grandma - Kala - Kerchak - King Triton - Leon - Lock, Shock, and Barrel - Merlin - Mickey Mouse - Minnie Mouse - Moogles - Owl - Perdita - Philoctetes - Piglet - Pinocchio - Pluto - Pongo - Queen of Hearts - Rabbit - Rock Titan - Roo - Roxas - Sabor - Sally - Sebastian - Selphie - Sephiroth - Smee - Snow White - Terk - The Mayor - The Peddler - Tidus - Tigger - Wakka - Wendy - White Rabbit - Winnie the Pooh - Yuffie - Xemnas - Zero|
|Destiny Islands - Disney Castle - Traverse Town - Wonderland - Olympus Coliseum - Deep Jungle - 100 Acre Wood - Agrabah - Monstro - Atlantica - Halloween Town - Neverland - Hollow Bastion - End of the World|
|Dive to the Heart - World Terminus - Kingdom Hearts|
|Ansem Report - Final Keyhole - Keyblade - Keyhole - Mickey's Letter - Postcard - Princesses of Heart - Trinity Mark - Door to Darkness- Dalmations|
|Kingdom Hearts Original Soundtrack - Kingdom Hearts Original Soundtrack Complete - Simple and Clean|
|Accessories - Artwork - Bosses - Enemies - Items - Other Weapons|
|Sora - Riku - Donald Duck - Goofy - Mickey Mouse|
Aladdin - Ariel - Jack Skellington - Peter Pan - Beast
|Simba - Genie - Cloud - Dumbo - Bambi - Tinker Bell - Mushu|
|Marluxia - Lexaeus - Larxene - Vexen - Zexion - Axel|
Hades - Jafar - Ursula - Oogie Boogie - Captain Hook - Maleficent - Ansem - Riku Replica
|Aerith - Alice - Belle - Card Soldiers - Cave of Wonders Guardian - Cheshire Cat - Cid - DiZ - Dr. Finkelstein - Eeyore - Flounder - Geppetto - Hercules - Iago - Jasmine - Jiminy Cricket - Kairi - Leon - Moogles - Naminé - Owl - Philoctetes - Piglet - Pinocchio - Pluto - Queen of Hearts - Rabbit - Roo - Sally - Sebastian - Selphie - Tidus - Tigger - Wakka - Wendy - White Rabbit - Winnie the Pooh - Yuffie|
|Traverse Town - Agrabah - Olympus Coliseum - Wonderland - Monstro - Halloween Town - Atlantica - Neverland - 100 Acre Wood - Hollow Bastion - Twilight Town - Destiny Islands - Castle Oblivion|
|Attack Cards - Card break - Cards - Enemy Cards - Friend Cards - Item Cards - Keyblade - Wayfinder - Magic Cards - Map Cards - Memory - Memory Pod - Premium Cards - Reload Card - Replica - Sleight - Summon Cards - World Cards|
|Kingdom Hearts Original Soundtrack Complete - Simple and Clean|
|Artwork - Bosses - Enemies - Keyblades|
|Roxas - Sora - Donald Duck - Goofy|
Mulan - Beast - Auron - Jack Sparrow - Aladdin - Jack Skellington - Simba - Tron - Riku
|Chicken Little - Genie - Stitch - Peter Pan|
|Xemnas - Organization XIII - Maleficent - Pete - Shan-Yu - Hades - Captain Barbossa - Jafar - Oogie Boogie - Scar - Ursula - MCP - Sark|
|Abu - Aerith - Ansem the Wise - Ariel - Auron - Axel - Bathtub - Belle - Brooms - Captain Barbossa - Captain Pete - Carpet - Cave of Wonders Guardian - Cerberus - Chien Po - Chip - Chip and Dale - Cid - Clara Cluck - Clarabelle Cow - Cloud - Cogsworth - Daisy Duck - Demyx - Dr. Finkelstein - Eeyore - Elizabeth Swann - Flora, Fauna, and Merryweather - Flotsam and Jetsam - Flounder - Fuu - Gopher - Gullwings - Hayner - Hercules - Horace Horsecollar - Hostile Program - Huey, Dewey, and Louie - Hydra - Iago - Jasmine - Jiminy Cricket - Kairi - Kanga - King Triton - Leon - Li Shang - Ling - Lock, Shock, and Barrel - Lumiere - Luxord - Megara - Merlin - Mickey Mouse - Mickey Mouse (Timeless River) - Minnie Mouse - Moogles - Mrs. Potts - Mufasa - Mushu - Nala - Naminé - Olette - Owl - Pain and Panic - Pegasus - Pence - Philoctetes - Piglet - Pluto - Prince Eric - Pumbaa - Rabbit - Rafiki - Rai - Reindeer - Roo - Saïx - Sally - Santa Claus - Sark - Scar - Scar's Ghost - Scrooge McDuck - Sebastian - Seifer - Selphie - Sephiroth - Setzer - Shenzi, Banzai, and Ed - The Emperor - The Experiment - The Mayor - The Peddler - The Wardrobe - Tifa - Tigger - Timon - Tinker Bell - Undead Pirates - Vivi - William Turner - Winnie the Pooh - Xaldin - Xehanort - Xigbar - Yao - Yen Sid - Yuffie - Zero|
|Twilight Town - Destiny Islands - Hollow Bastion/Radiant Garden - The Land of Dragons - Beast's Castle - 100 Acre Wood - Olympus Coliseum - Disney Castle - Timeless River - Atlantica - Port Royal - Agrabah - Halloween Town - Pride Lands - Space Paranoids - The World That Never Was - Keyblade Graveyard|
|Simulated Twilight Town - Dive to the Heart - Old Mansion - Betwixt and Between - Mysterious Tower - Underworld - Christmas Town - Castle That Never Was - Cavern of Remembrance - Chambers of Repose and Waking - Kingdom Hearts|
|Cornerstone of Light - Drive Form - Gate - Hollow Bastion Restoration Committee - Kairi's Letter - Keyblade - Kingdom Hearts Encoder - Organization XIII - Princesses of Heart - Reaction Command - Secret Ansem Report - Skateboard - Struggle|
|Kingdom Hearts II Original Soundtrack - Kingdom Hearts Original Soundtrack Complete - Sanctuary|
|Accessories - Artwork - Bosses - Enemies - Items - Other Weapons - Songs|
|Roxas - Axel - Demyx - Larxene - Lexaeus - Luxord - Marluxia - Saïx - Vexen - Xaldin - Xemnas - Xigbar - Xion - Zexion|
|Donald Duck - Goofy - King Mickey - Riku - Sora|
|Abu - Aladdin - Beast - Belle - Captain Hook - Card Soldiers - Carpet - Cave of Wonders Guardian - Cheshire Cat - Cogsworth - DiZ - Doorknob - Dr. Finkelstein - Genie - Hayner - Hercules - Jack Skellington - Jasmine - Kairi - Lock, Shock, and Barrel - Lumiere - Moogle - Mr. Smee - Naminé - Olette - Pence - Pete - Philoctetes - Queen of Hearts - Tinkerbell - White Rabbit - Zero|
|Agrabah - Beast's Castle - Castle Oblivion - Destiny Islands - Halloween Town - Kingdom Hearts - Neverland - Olympus Coliseum - The World That Never Was - Twilight Town - Wonderland|
|Castle That Never Was - Old Mansion - Simulated Twilight Town|
|Heart - Heartless - Keyblade - Mission Mode - Nobody - Organization XIII - Organization XIII Device - Replica - Replica Program - Roxas's Diary - Sea-salt ice cream|
|Kingdom Hearts Birth by Sleep & 358/2 Days Original Soundtrack - Sanctuary|
|Rings - Artwork - Bosses - Enemies - Other Weapons|
|Terra - Ventus - Aqua - Lingering Will|
Mickey Mouse - Zack - Experiment 626 - Prince Phillip - Hercules - Peter Pan
|Terra - Ventus - Aqua - Vanitas - Maleficent - Cinderella - Snow White - Experiment 626 - Mickey Mouse - Donald Duck - Goofy - Zack - Peter Pan - Pete|
|Master Xehanort - Vanitas - Braig - Xehanort - Maleficent - Lady Tremaine - Anastasia - Drizella - Lucifer - The Queen - Magic Mirror - Gantu - Experiment 221 - Hades - Ice Colossus - Captain Hook - Captain Dark|
|Aeleus - Ansem the Wise - Aurora - Brooms - Captain Justice - Chip and Dale - Cinderella - Crocodile - Daisy Duck - Dilan - Donald Duck - Dr. Jumba - Even - Fairy Godmother - Flora, Fauna, and Merryweather - Grand Councilwoman - Grand Duke - Horace Horsecollar - Huey, Dewey, and Louie - Ienzo - Isa - Jaq - Kairi - Kairi's Grandma - Lea - Lost Boys - Maleficent's goons - Master Eraqus - Merlin - Minnie Mouse - Moogle - Philoctetes - Pluto - The Prince - Prince Charming - Rabbit - Riku - Scrooge McDuck - Seven Dwarfs - Smee - Snow White - Sora - Tigger - Tinker Bell - Unknown - Vanitas Remnant - Winnie the Pooh - Yen Sid|
|Land of Departure - Enchanted Dominion - Castle of Dreams - Dwarf Woodlands - Destiny Islands - Radiant Garden - Olympus Coliseum - Disney Town - Deep Space - Mirage Arena - Neverland - Mysterious Tower - Keyblade Graveyard - Castle Oblivion|
|Dive to the Heart - 100 Acre Wood - Kingdom Hearts - Chamber of Waking|
|Keyblade - Keyblade Inheritance Ceremony - Keyblade Armor - Keyblade Glider - Keyblade Master - Keyblade War - Mark of Mastery - Million Dreams Award - Princesses of Heart - Blank Points - Unversed|
|Deck Command - D-Link - Command Style - Shotlock - Arena Mode - Command Board|
|Kingdom Hearts Birth by Sleep & 358/2 Days Original Soundtrack - Simple and Clean|
|Accessories - Artwork - Bosses - Enemies|
|Sora | Riku|
|Young Xehanort | Master Xehanort | Xemnas | Ansem, Seeker of Darkness | Braig | Isa | Maleficent | Pete | Claude Frollo | CLU | Rinzler|
Kairi | Mickey Mouse | Lea | Yen Sid | Donald Duck | Goofy | Jiminy Cricket | Quasimodo | Esmeralda | Phoebus | Laverne, Victor, and Hugo | Pinocchio | Geppetto | Blue Fairy | Princess Minnie | Beagle Boys | Julius | Ursula | Monstro | Chernabog | Neku Sakuraba | Joshua | Beat | Shiki | Rhyme | Sam Flynn | Quorra | Kevin Flynn | Even | Ienzo | Aeleus | Roxas | Xion | Vanitas | Naminé | Xehanort
|Destiny Islands | Traverse Town | La Cité des Cloches | The Grid | Prankster's Paradise | Country of the Musketeers | Symphony of Sorcery | Radiant Garden | The World That Never Was | Realm of Darkness | Dive to the Heart | Disney Castle | Keyblade Graveyard | Mysterious Tower|
|Castle That Never Was | Sleeping Worlds|
|Dream Eater | Keyhole of Sleep | Keyblade War | Mark of Mastery | True Organization XIII | Another Guardian of Light|
|Kingdom Hearts 3D: Dream Drop Distance Original Soundtrack | Simple and Clean | Sanctuary|
|Introduced in Kingdom Hearts|
|Dive to the Heart | Destiny Islands | Disney Town/Disney Castle | Traverse Town | Wonderland | Olympus Coliseum | Deep Jungle | Agrabah | Monstro | Atlantica | Halloween Town | Neverland | Radiant Garden/Hollow Bastion | 100 Acre Wood | End of the World | Kingdom Hearts | Realm of Darkness|
|Introduced in Kingdom Hearts: Chain of Memories|
|Land of Departure/Castle Oblivion | Twilight Town|
|Introduced in Kingdom Hearts II|
|Simulated Twilight Town | Mysterious Tower | The Land of Dragons | Beast's Castle | Underworld | Timeless River | Port Royal | Christmas Town | Pride Lands | Space Paranoids | The World That Never Was | Keyblade Graveyard|
|Introduced in Kingdom Hearts Birth by Sleep|
|Enchanted Dominion | Dwarf Woodlands | Castle of Dreams | Deep Space | Mirage Arena|
|Introduced in Kingdom Hearts coded|
|Introduced in Kingdom Hearts 3D|
|La Cité des Cloches | The Grid | Prankster's Paradise | Country of the Musketeers | Symphony of Sorcery|
|Introduced in Kingdom Hearts χ [chi]|