Aincrad (アインクラッド, Ainkuraddo) is the main setting of Sword Art Online and the many different fan-fictions.


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 Meaning

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. It is also inferable that its design is symbolic for time and space. The vertical axis represents time and the circular floors represent space.


For information about canon's floors and cities click here.

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 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.

Floor Number Landmarks & Locations
1 Starting City, Black Castle Prison(Ludus)
4 Dusty Road
7 Braetein
10 Talmia, Talmia Plains, Vespera
14 Vulcan Range, home of Hephaestus

Londinium, Secandance, Forest of the Wanders, Never-ending Ridge

28 Luciad, Pendragon Court HQ
30 Azure Swamp
31 Ebony Swamp
33 Blackwood Forest, Ravenwing
34 Ayres, Goblin Fortress
35 Forest of Wandering, Knights of Round Manor House
37 Aurora's Edge, Snowpeak Range, Snowpeak Castle, home of The Chronicler, Twilight Fields
44 Atlas Range
45 Capua, Aincrad's Arena
49 Camelot, Camlann, Volcanic Mederaut Mountines,
50 Royal Knights HQ, Laberint 50th, Maximus Quest,
51 Arashi


For information about canon's bosses click here

Each Boss is unique and stronger than the previous. Here, there will be more than one boss for each floor, due to the many different editors.

Boss Name Floor Other Details
Illfang the Kobold Lord 1st Floor None
Belphegor, the rage king 4th Floor None
Theokeler 26th Floor None
Thotar the Tribal King 30th Floor None
Flagoth 31st Floor None
Ifrit 44th Floor None
Hell Wraith 51st Floor None
Cerdic Unknown Floor Apparition on floor 26


For information about canon's monsters click here

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.

Monster Name Floor Other Details
Frost Sentry 37th Floor Only appear in Snowpeak Castle

New Aincrad

For information about canon's New Aincrad click here


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