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Aincrad

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This page is about Aincrad, the floating castle in Sword Art Online and the New Aincrad in ALfheim Online. You maybe looking for the Aincrad Arc or the manga adaptation named as Aincrad.
Warning Spoiler Alert: This article/section contains details about future plotlines described in the light novels, not covered in the anime. Do not proceed unless you want to be spoiled.

Aincrad

Aincrad
Kanji

アインクラッド

Romaji

Ainkuraddo

Location Information
Game
Controlled By

Kayaba Akihiko (SAO)

Debuts
Novel

Volume 1

Manga

Aincrad Manga Stage.001

Anime

Episode 1

Aincrad (アインクラッド, Ainkuraddo?) is the first «Realized World» shown in the Sword Art Online series and the stage for the first VRMMORPG, «Sword Art Online», created by Kayaba Akihiko. It later became one of the nine realms of New ALfheim Online and the stage for the game's second Grand Quest.

BackgroundEdit

Aincrad is the world set as the stage for «Sword Art Online», declared to be the world's first VRMMORPG in history. It was incorporated in «ALfheim Online» on May 2025.

The base currency of Aincrad is the Cor.

Etymology and MeaningEdit

The castle's name came from the concept of a «Realized World», called An Incarnating Radius (アン・インカーネイティング・ラディウス, An Inkāneitingu Radiusu?), which has been abbreviated as Aincrad.[1] It is also inferable that its design is symbolic for time and space. The vertical axis represents time and the circular floors represent space.[2]

GeographyEdit

Aincrad is an iron-and-stone made floating castle that has about ten kilometers floor base diameter and consists of a hundred floors stacking straight upwards, meaning that each floor's diameter is a bit smaller than the previous one. On each floor, there are a couple of large cities along with countless small scale towns and villages, forests, plains, and even lakes. Only one stairway links each floor to another, and the stairways exist beyond the boss room of each Labyrinth. The «Teleport Gates»[3] of every unlocked cities are connected to one another.

It is possible to climb the outer circumference of Aincrad, but trying to climb beyond a floor that has not been unlocked will result in being blocked by a barrier and a visual error.[4]

Aincrad Locations Navigation Bar
Teleport Gate
Floor Notable locations and landmarks
1 Starting CityBlack Iron Palace, Hidden DungeonMonument of Swordsmen[Navbar 1]Monument of Life[Navbar 2]Chamber of Resurrection[Navbar 3]TolbanaHorunka Village
2 Urbus, Urbus Teleport Gate Plaza, Marome Village, Taran Village
3 Forest of Wavering Mist
4 Lobria, Lobria Teleport Gate Plaza
7 Monster Arena
8 Frieven Village, Frieven Teleport Gate Plaza
10 Thousand Snake Castle
11 Taft, Taft Teleport Gate
19 Ralberg, Ralberg Teleport Gate, Hill of the Cross, Griselda's Tomb
20 Sunshine Forest
22 Coral Village, Coral Teleport Gate Plaza, Forest House K4, Lake Outside Coral Village,
24 Panareze, Panareze Teleport Gate Plaza
27 Ronbaru Town, Ronbaru Teleport Gate
28 Wolf Plains
35 Forest of WanderingMishe, Mishe Teleport Gate Plaza
39 Former location of the Knights of Blood Headquarters
46 Ant Hill
47 Floria, Floria Gate Plaza, Hill of Memories, Forest of Giant Flowers
48 Lindarth, Lindarth Teleport Gate Plaza
49 Myujen, Myujen Teleport Gate Plaza
50 Algade, Algade Teleport Gate Plaza
55 Granzam, Granzam Teleport Gate Plaza, Knights of Blood Headquarters, West Mountain
56 Pani, Divine Dragon Alliance Headquarters
57 Marten, Marten Teleport Gate Plaza
59 Danac, Danac Teleport Gate Plaza
61 Selmburg, Selmburg Teleport Gate Plaza
65 Old Castle Labyrinth
66 Old Castle Labyrinth
74 Kamdet, Kamdet Teleport Gate Plaza
75 Collinia, Collinia Teleport Gate Plaza
100 Ruby Palace
  1. only in New ALO
  2. only in the SAO official service
  3. only in the SAO Beta


MonstersEdit

A variety of unique monsters that can be found on every floor and in every dungeon in Aincrad. They are the main source of income for most players, as they drop Cor and other items to the victorious players. Like NPCs, monsters, except for most if not all Bosses, re-spawn after a certain amount of time has passed since they were killed.

Known BossesEdit

Boss Name Floor Other Details
«The Fatal Scythe» 1st Floor (Bonus) Boss Monster of the Black Iron Palace Hidden Bonus Dungeon[4]
«Illfang the Kobold Lord» 1st Floor
«Nato the Colonel Taurus» 2nd Floor Mid-boss
«Baran the General Taurus» 2nd Floor Closed Beta Floor Boss
Mid-boss in the death game
«Asterius the Taurus King» 2nd Floor Floor Boss in the death game
«Bullbous Bow» 2nd Floor (Field) A Field Boss of the 2nd Floor.
«Nephila Regina»[5] 3rd Floor (Dungeon)
«Fallen Elf Commander»[6] 3rd Floor (Quest)
«Nerius the Evil Treant»[7] 3rd Floor Quest boss for the 3rd Floor portion of the first campaign quest in SAO.
«The Witch of the West» 22nd Floor (Quest) Can only be defeated with the help of the roar of a lion.
Two-Headed Giant 25th Floor
Metallic Elemental 27th Floor
«Nicholas The Renegade» 35th Floor (Event) A Christmas event Flag Mob in the Forest of Wandering[8]
Six-Armed Metallic Buddha Statue 50th Floor
«X'rphan the White Wyrm» 55th Floor (Quest)[9]
«Geocrawler» 56th Floor (Field) A Field Boss of the 56th Floor.
Armored Stone Warrior 60th Floor[10]
«The Gleam Eyes» 74th Floor[11]
«The Skull Reaper» 75th Floor[12]
Heathcliff 100th Floor (supposedly)

Known MonstersEdit

Monster Name (English) Monster Name (Japanese) Location References
Ant queen 46th Floor [13]
«Bull Slug» ブルスラッグ 61st Floor [14]
«Dark Dwarf Miner» 闇ドワーフ(ダークドワーフ)・マイナー 27th Floor - Labyrinth [15]
«Blood Wolf Leader» ブラッド・ウルフ・リーダー 28th Floor [16]
Coppice Spider 3rd Floor [17]
«Dark Elven Wolf Handler» 黒エルフの狼使い(ダークエルブン・ウルフハンドラー) 3rd Floor [18]
«Dark Elven Royal Guard» ダークエルブン・ロイヤルガード 3rd Floor [19]
«Demonic Servant» デモニッシュ・サーバント 74th Floor - Labyrinth [11]
«Dire Wolf» ダイアー・ウルフ 1st Floor [20]
«Drunk Apes» ドランクエイプ 35th Floor [21]
«Dusk Lizard» ダスクリザード [22]
«Elder Treant» エルダー・トレント 3rd Floor [23]
Elder Sapling 3rd Floor [17]
«Fallen Elf Warrior» フォールン・エルフ・ウォリアー [6]
«Feathered Little Dragon» フェザーリドラ [21]
«Forest Elven Hallowed Knight»[† 1] フォレストエルブン・ハロウドナイト 3rd Floor [24]
«Forest Elven Falconer» 森エルフの鷹使い(フォレストエルブン・ファルコナー) 3rd Floor [18]
«Frenzy Boar»[† 2] フレンジーボア 1st Floor [25]
«Frost Bone» フロストボーン 55th Floor [9]
Gargoyle 27th Floor [26]
«Garish Gerbera» ガリッシュ・ガーベラ 47th Floor [27]
Giant Venus Fly Trap 47th Floor [28]
«Granite Elementals» 鉱石エレメンタル(グラナイト・エレメンタル) 27th Floor - Labyrinth [15]
«Jagged Worm» ジャグド・ワーム 2nd Floor [29]
«Killer Mantis» キラーマンティス 20th Floor [16]
Land Anemone 47th Floor [27]
«Large Nepent» ラージネペント 1st Floor [30]
«Lesser Taurus Striker» レッサートーラス・ストライカー 2nd Floor [31]
«Little Nepent»[† 3] リトルネペント 1st Floor [30]
«Lizardman Lord»[† 4] リザードマンロード 74th Floor - Labyrinth [32]
«Maroon Wolf» マルーン・ウルフ 22nd Floor [33]
«Ragout Rabbit»[† 5] ラグー・ラビット 74th Floor [22]
«Red Spotted Beetle» レッド・スポテッド・ビートル 2nd Floor [34]
«Ruin Kobold Sentinel» ルインコボルド・センチネル 1st Floor [35]
«Ruin Kobold Trooper» ルインコボルド・トルーパー 1st Floor - Labyrinth [36]
«Scavenger Toads» スカベンジトード 1st Floor [10]
«Storm Hornet» ストームホーネト 2nd Floor [29]
Swamp Kobold Trapper 1st Floor [17]
«Taurus Ironguard» トーラス・アイアンガード 2nd Floor - Labyrinth [37]
«Taurus Ringhurler» トーラス・輪投げ男(リングハーラー) 2nd Floor - Labyrinth [37]
«The King of Lakes» 湖のヌシ 22nd Floor - event monster [38]
«Thicket Spider» シケット・スパイダー [† 6] 3rd Floor [39]
«Treant Sapling» トレント・サプリング 3rd Floor [40]
«Trembling Cow» トレンブリング・カウ 2nd Floor [41]
«Trembling Ox» トレンブリング・オックス 2nd Floor [42]
Werelions[† 7] 40th Floor [43]
Werepanthers[† 7] 22nd Floor - quest area [43]
«Wind Wasp» ウインドワスプ 2nd Floor [29]

New Aincrad (ALO Version)Edit

Aincard in ALO

Aincrad in ALfheim Online

At the end of Fairy Dance Arc, with the sprouting of the «World Seed», some of the old ALO players funded a new company, Ymir, which bought all of the ALfheim Online data from RECT Progress Inc. for a small fee and discovered that a complete copy of the castle existed on the server. As the company had to fight a decrease in the playerbase due to RECT Progress' inhuman experiments and because the company was formed by veteran MMO game players who had been playing since the 2D age and could not bear the deletion of the intricately designed castle, the castle of New Aincrad was implemented into the ALO world, floating above the continent of Alfheim, on May 2025.

The castle is currently being cleared by guilds and players without a guild. Such raids are led by high-level players like General Eugene

ChangesEdit

The castle is essentially identical to the original Aincrad, except for a few key features. First, the bosses and dungeon monsters were made significantly more difficult, as there is no threat of real death in the ALO's Aincrad. Dungeon maps and similar features were likely re-done, as the Clearers in ALO continue to utilize mapping and scouting strategies on bosses, while all the bosses were changed to brand new ones. The last known change is on the Monument of Life. After this update, the monument, which before used to list existing players who were still alive at the time, is now called as the «Monument of Swordsmen» and is used to list players who participate in clearing the boss of each floor. As the monument can only record seven player names for each floor cleared at most (due to space limitations), if more than one party participates in the battle against the boss of the floor, only the name of the leader of each party will be listed on the monument, however, if one party of up to seven players is able to beat the boss on their own, the name of each member of the party will appear on the monument.[26]

Features and RestrictionsEdit

Since Aincrad was fused with ALfheim Online's gameplay, the system was also designed to re-account for magic, flying, and the new limitations and additions with Sword Skills. It is now possible to fly from floor to floor in ALO's Aincrad, although the outer circumference is closed for floors which have not yet been unlocked.[15] Additionally, a flight altitude limit for players is set at the level of the 50th Floor, preventing players from examining the outside of the floors above it, including the top of the castle.[15][44] Dungeons are no-flying zones, and the Remain Light system was incorporated from ALO.

Known BossesEdit

Boss Name Floor Other Details
Wadjet the Flaming Serpent 8th Floor
The Four-Armed Giant 27th Floor Non-official name
Large Crustacean[45] 28th Floor Non-official name

GalleryEdit

NotesEdit

  1. Named as "Forest Elf Officer" in the web version.
  2. Level 1
  3. Level 3
  4. Level 82
  5. Super Rare
  6. Written in English with furigana in the raw
  7. 7.0 7.1 A monster race, not the name of an individual monster

ReferencesEdit

  1. Volume 8, Calibur
  2. Volume 5, Chapter 2
  3. Volume 1, Prologue
  4. 4.0 4.1 Volume 2, Morning Dew Girl
  5. Progressive Volume 2, page 106
  6. 6.0 6.1 Progressive Volume 2, page 362
  7. Progressive Volume 2
  8. Volume 2, Red-nosed Reindeer
  9. 9.0 9.1 Volume 2, Warmth of the Heart
  10. 10.0 10.1 Volume 2, Morning Dew Girl Part 3
  11. 11.0 11.1 Volume 1, Chapter 9
  12. Volume 1 Chapter 21
  13. Volume 2, Red-nosed Reindeer, Part 1
  14. Volume 4, Chapter 6
  15. 15.0 15.1 15.2 15.3 The Day After
  16. 16.0 16.1 Episode 3
  17. 17.0 17.1 17.2 Monochrome Concerto
  18. 18.0 18.1 Progressive Volume 2, page 70
  19. Progressive Volume 2, page 41
  20. Episode 1
  21. 21.0 21.1 Volume 2, The Black Swordsman, Part 1
  22. 22.0 22.1 Volume 1, Chapter 5
  23. Progressive Volume 2, page 25
  24. Progressive Volume 2, page 31
  25. Volume 1, Chapter 2
  26. 26.0 26.1 Volume 7, Chapter 3
  27. 27.0 27.1 Volume 2, The Black Swordsman, Part 3
  28. Episode 4
  29. 29.0 29.1 29.2 Progressive Volume 1, Rondo of a Fragile Blade, Part 2
  30. 30.0 30.1 First Day
  31. Progressive Volume 1, Rondo of a Fragile Blade, Part 8
  32. Volume 1, Chapter 1
  33. Material Edition 11
  34. Progressive Volume 1, Rondo of a Fragile Blade, Part 1
  35. Progressive Volume 1, Aria of a Starless Night, Part 6
  36. Progressive Volume 1, Aria of a Starless Night, Part 1
  37. 37.0 37.1 Progressive Volume 1, Rondo of a Fragile Blade, Part 12
  38. Volume 1, Chapter 19
  39. Progressive Volume 2, page 77
  40. Progressive Volume 2, page 24
  41. Progressive Volume 1, Rondo of a Fragile Blade, Part 3
  42. Progressive Volume 1, Intermission - Reason for the Whiskers
  43. 43.0 43.1 The Day Before
  44. Author's commentary
  45. Volume 7 Chapter 10

NavigationEdit

ALfheim Online Locations Navigation Bar
Midgard New Aincrad - See Aincard Location Navigation Bar for locations in new Aincrad
World Tree Alne - Virtual Lab(Floating City) - Yggdrasil City
Alfheim Ancient Forest - Butterfly Valley - Swilvane - Legrue Corridor - Legrue - Thule Island - Undersea Temple
Jötunheimr Great Void - Thrymheim

Start a Discussion Discussions about Aincrad

  • Bosses

    3 messages
    • Some information on Progressive Volume 2 but I forgotten about them...
    • A raid group is only required for floor bosses. Field bosses can be handled with a party or two, depending on how strong the members of the pa...
  • So should SAO:IM floor, boss info add in to the list?

    3 messages
    • and why some boss in the article donot have "the" in their name...
    • Don't turn the first sentence into a title. Titles are supposed to be a short name for the topic, not the whole idea in it. On topic, Infin...

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