Warning Spoiler Alert: This article or section contains details about plotlines not covered in the anime. Do not proceed unless you wish to be spoiled.

The 27th Floor (第27層, Dai 27-sō?) of Aincrad is a floor of perpetual darkness, with very few openings in the exterior of the floor, meaning that no sunlight shines in the floor even during the day.[1] The floor is rich in ore items, therefore, the floor was popular among the artisan players in Sword Art Online.[2]


The floor is filled with craggy, rocky mountains[2] and, in terms of impression, the floor is quite similar to the underground of the Gnome territory in the north of Alfheim—numerous stalactites hang unevenly from the ceiling of the next floor and, above those, are large prismatic gems which let out a hazy blue glow.[1]

Settlements and Notable LocationsEdit


Ronbaru is a night elf-theme city, located at the bottom of a wide circular valley of the floor.[1] The town is carved out of one of the rocky mountains that are abundant on the floor.[2]


The Labyrinth, like Ronbaru, is also carved out of one of the mountains that are abundant on the floor.[2] Many crystal hexagonal prisms about the size of small houses stretch out from the base of the tower, hazily illuminating the tower with a blue phosphorescence. Shortly after the entrance, the natural cave gives way to a slate-tiled, man-made tunnel.[3]


On June 22, 2023, members of the Moonlit Black Cats came to the Labyrinth of this floor to hunt for Cor to arrange a function when their guild leader, Keita, came back with the keys to their new guild home. However, after they earned the targeted amount of money, Ducker found a hidden room with a treasure chest. Due to the insufficient level of his trap dismantling skill, he triggered a trap that lead to continuously spawning Mineral Elementals and Dark Dwarf Miners, while an Anti-Crystal Area prevented the use of Teleport Crystals. Kirito was the only member of the guild present in the battle who managed to survive and was burdened with the guilt of the death of his guildmates ever since.

The 27th Floor in New ALfheim Online was reached between December 24, 2025 and January 6, 2026, while the boss room was discovered by January 8, 2026. The Sleeping Knights challenged the Floor Boss on January 8, 2026, but they were wiped out as the boss revealed its last resort attacks. As another guild had used «Peeping» to spy on their battle, by the time the Sleeping Knights returned to the Boss Room, twenty players had already blocked off access to the room. After Kirito arrived and stalled the main force of the guild, the Sleeping Knights broke into the Boss Room and sealed themselves in. After forty minutes of intense battle, Asuna realized what the weakness of the boss was and had Yuuki finish off the boss by using her Original Sword Skill Mother's Rosario to deal eleven hits at its weak point.

Known BossesEdit

Known MonstersEdit




Aincrad Locations Navigation Bar
Teleport Gate
Floor Notable locations and landmarks
1 Town of BeginningsBlack Iron Palace, Hidden DungeonMonument of Swordsmen[Navbar 1]Monument of Life[Navbar 2]Chamber of Resurrection[Navbar 3]TolbanaHorunka Village, Medai Village
2 Urbus, Urbus Teleport Gate Plaza, Marome Village, Taran Village
3 Forest of Wavering Mists, Zumfut, Zumfut Teleport Gate Plaza, Dessel
4 Rovia, Rovia Teleport Gate Plaza, Bear Forest, Yofel Castle, Usco Village, Caldera Lake
5 Karluin, Karluin Teleport Gate Plaza, Mananarena, Shiyaya
6 Stachion, Stachion Teleport Gate Plaza, Suribus, Ararro, Castle Galey, Lake Talpha
7 Monster Arena[Navbar 4]
8 Frieven Village, Frieven Teleport Gate Plaza
9 Dark Elf Queen's Castle[Navbar 5]
10 Thousand Snake Castle[Navbar 6]
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
25 Giltstein, Giltstein Teleport Gate Plaza, Former location of the Knights of Blood Headquarters
27 Ronbaru Town, Ronbaru Teleport Gate
28 Wolf Plains
35 Forest of WanderingMishe, Mishe Teleport Gate Plaza
39 Nolfret, Nolfret Teleport Gate Plaza, Former location of the Knights of Blood Headquarters
40 Jaileum, Jaileum Teleport Gate Plaza
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
72 Ozmalt, Ozmalt Teleport Gate Plaza, Agarla Village
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
  4. According to Kirito in Progressive Volume 1, Rondo of a Fragile Blade, Part 1
  5. According to Kizmel in Progressive Volume 3, Barcarolle of Froth, Part 7
  6. According to Kirito in Progressive Volume 1, Aria of a Starless Night, Part 14
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
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