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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 wikia contains details about future plotlines described in the light novels. Do not proceed unless you want to be spoiled.






Location Information
Controlled By

Kayaba Akihiko (SAO)


Volume 1


Aincrad Manga Stage.001


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 9 realms of New ALfheim Online and the stage for the game's second Grand Quest.


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 Col.

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]


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 exists beyond the boss room of each dungeon. 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 hasn't been unlocked will result in being blocked by a barrier and a visual error.[4]

Floor Number Notable Landmarks & Locations
1 «Starting City»,[5] «Black Iron Palace»[6] («Aincrad Liberation Force's» («The Army») Headquarters[4]), «Monument of Swordsmen»[7](New ALO), «Monument of Life»[8](SAO), «Room of Resurrection» (SAO Beta), «Tolbana» (Raid base), «Horunka» Village
2 «Urbus», Urbus Teleport Gate Plaza, «Marome Village», «Taran Village» (Raid base)
3 Forest of Wavering Mist
7 Monster Arena
8 «Friben Village» (Silica's former hometown), Friben Teleport Gate Plaza
10 «Thousand Snake Castle»
11 «Taft» (former location of the «Moonlit Black Cats» Headquarters), Taft Teleport Gate
19 «Ralberg» (former location of the «Golden Apple» Headquarters), Ralberg Teleport Gate, «Hill of the Cross», Griselda's Tomb
20 «Sunshine Forest»[9]
22 «Coral» Village, Coral Teleport Gate Plaza, Kirito, Asuna and Yui's Forest Home[4] Lake Outside «Coral Village», 
24 «Panareze»,[10] Panareze Teleport Gate Plaza
27 «Ronbaru» Town,[10] Ronbaru Teleport Gate
28 «Wolf Plains»[9]
35 «Forest of Wandering», «Mishe»,[11] 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»[12]
48 «Lindas» (Lisbeth's hometown),[13] Lindas Teleport Gate Plaza
49 «Myujen»,[9] Myujen Teleport Gate Plaza
50 «Algade» (Kirito's former hometown and the location of Agil's shop),[14] Algade Teleport Gate Plaza
55 «Granzam», Granzam Teleport Gate Plaza, «Knights of Blood» Headquarters, «West Mountain».[13]
56 «Pani» (Headquarters of the Divine Dragon Alliance), Pani Teleport Gate Plaza
57 «Marten»,[15] Marten Teleport Gate Plaza
59 «Danac»,[16] Danac Teleport Gate Plaza
61 «Selmburg» (Asuna's former hometown),[14] Selmburg Teleport Gate Plaza.
65 Old Castle Labyrinth (Horror theme)[17]
66 Old Castle Labyrinth (Horror theme)[17]
74 «Kamdet»,[18] Kamdet Teleport Gate Plaza.
75 «Collinia»,[19] Collinia Teleport Gate Plaza.
100 «Ruby Palace»


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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 Col 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 Kernel Taurus» 2nd Floor Spoiler Alert! The following pertains to Untranslated, or Non-Released Content!
«Baran the General Taurus» 2nd Floor Spoiler Alert! The following pertains to Untranslated, or Non-Released Content!
Closed Beta Floor Boss
Mid-boss in the death game
«Asterios The Taurus King» 2nd Floor Spoiler Alert! The following pertains to Untranslated, or Non-Released Content!
Floor Boss in the death game
«Bullbous Bow» 2nd Floor (Field) A Field Boss of the 2nd Floor.
«Nephila Regina»[20] 3rd Floor (Dungeon)
«Fallen Elf Commander»[21] 3rd Floor (Quest)
«Nerius the Evil Treant»[22] 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[23]
Six-Armed Metallic Buddha Statue 50th Floor
«X'rphan the White Wyrm» 55th Floor (Quest)[13]
«Geocrawler» 56th Floor (Field) A Field Boss of the 56th Floor.
Armored Stone Warrior 60th Floor[24]
«The Gleam Eyes» 74th Floor[25]
«The Skull Reaper» 75th Floor[26]
Heathcliff 100th Floor (supposedly)

Known MonstersEdit

New Aincrad (ALO Version)Edit

Aincard in ALO

Aincrad in ALfheim Online

At the end of Fairy Dance Arc (ALfheim Online), with the sprouting of the «World Seed», some of the old ALO players funded a new company, Ymir, which bought all of the ALO data from RECTO 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 RECTO Progress' inhuman experiments and because the company was formed by veteran MMO players who had been playing since the 2D age and couldn't 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 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 7 player names for each floor cleared at most (due to space limitations), if more than 1 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 1 party of up to 7 players is able to beat the boss on their own, the name of each member of the party will appear on the monument.[50]

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, though there is an invisible wall at the highest front line floor, preventing access via flight to floors that have not yet been unlocked. Dungeons are no-flying zones, and the remain-light system was incorporated from ALO.

It is currently being cleared by guilds and the like, led by high-level players like General Eugene.

Known BossesEdit

Boss Name Floor Other Details
Wadjet the Flaming Serpent 8th Floor
The Four-Armed Giant 27th Floor Non-official name
Large Crustacean[51] 28th Floor Non-official name



  1. Named as "Dark Elf Sentry" in the web version.
  2. Named as "Forest Elf Officer" in the web version.


  1. Volume 8, Caliber
  2. Volume 5, Chapter 2
  3. Volume 1, Prologue
  4. 4.0 4.1 4.2 4.3 Volume 2, Morning Dew Girl
  5. 5.0 5.1 Volume 1, Chapter 2
  6. Volume 1, Chapter 4
  7. Volume 7, Chapter 6
  8. Volume 1, Chapter 3
  9. 9.0 9.1 9.2 9.3 9.4 Episode 3
  10. 10.0 10.1 10.2 Volume 7, Chapter 3
  11. 11.0 11.1 Episode 4
  12. 12.0 12.1 12.2 Volume 2, The Black Swordsman, Part 3
  13. 13.0 13.1 13.2 13.3 Volume 2, Warmth of the Heart
  14. 14.0 14.1 14.2 14.3 Volume 1 Chapter 5
  15. Volume 8, A Murder Case in the Area, Part 1
  16. Episode 5
  17. 17.0 17.1 Volume 2, Morning Dew Girl, Part 1
  18. Episode 8
  19. Volume 1, Chapter 13
  20. Progressive Volume 2, page 106
  21. 21.0 21.1 Progressive Volume 2, page 362
  22. Progressive Volume 2
  23. Volume 2, Red-nosed Reindeer
  24. 24.0 24.1 Volume 2, Morning Dew Girl Part 3
  25. 25.0 25.1 Volume 1 Chapter 9
  26. Volume 1 Chapter 21
  27. Volume 2, Red-nosed Reindeer, Part 1
  28. Volume 4 Chapter 6
  29. 29.0 29.1 The Day After
  30. 30.0 30.1 30.2 Monochrome Concerto
  31. Progressive Volume 2, page 239
  32. Progressive Volume 2, page 41
  33. 33.0 33.1 Volume 2, The Black Swordsman, Part 1
  34. Progressive Volume 2, page 25
  35. Progressive Volume 2, page 31
  36. Progressive Volume 2 p.3x
  37. 37.0 37.1 First Day
  38. Volume 1, Chapter 1
  39. Material Edition 11
  40. 40.0 40.1 Rondo of the Transient Sword
  41. Progressive Volume 1, Chapter 1, Part 6
  42. Progressive Volume 1, Chapter 1, Part 1
  43. Volume 1, Chapter 19
  44. Progressive Volume 2, page 77
  45. Progressive Volume 2, page 24
  46. Progressive Volume 1, Chapter 2, Part 3
  47. Progressive Volume 1, Intermission - Reason for the Whiskers
  48. 48.0 48.1 The Day Before
  49. Episode 1
  50. Volume 7
  51. Volume 7 Chapter 10


Aincrad Locations Navigation Bar
Teleport Gate
1 Starting CityBlack Iron Palace, Hidden DungeonMonument of Swordsmen[1]Monument of Life[2]Room of Resurrection[3]TolbanaHorunka Village
2 Urbus, Urbus Teleport Gate Plaza, Marome Village, Taran Village
3 Forest of Wavering Mist
7 Monster Arena
8 Friben Village, Friben 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 Home, 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 Lindas, Lindas 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, Pani Teleport Gate Plaza
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

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

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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