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Sword Art Online Progressive Volume 04, Yen Press release
Karluin, main city of Aincrad's fifth floor

Ruins

Relic items, such as Karl Coins

Underground Catacombs Dungeon

Underground Tunnel

Town of Mananarena

The Dead Woods

The Giant Maze

Labyrinth Tower

Floating Castle Aincrad, Floor Data: Fifth Floor
Just like it was during the beta, the design theme of the fifth floor is "ruins." Only 30 percent of the six-mile-diameter floor is natural terrian; the rest is all mazelike ruins. It's also known for being the first floor to have more vertical elements than just the flat features of the previous floors. There are underground catacombs, dungeon ruins that stretch down belowground, and a townexcavated out of the earth, all of which have little light–making them fertile PK areas during the beta.

The main city, Karluin, rests in the middle of a massive swath of ruins on the southern end of the floor. Though the buildings of bluish stone blocks are falling apart here and there, the center of town is full of leather and canvas tents, which give it a chaotic liveliness. In the ruined temples and plazas near Karluin, gems and accessories known as "relics" can be found.

The boss of the fifth floor is Fuscus the Vacant Colossus. If all is the same as in the beta test, it should be a golem that runs on magic power...

Map illustration: Tatsuya Kurusu