Virtual Lab

The Floating City is a city, rumored to be located at the top of World Tree. It is a city where Fairy King Oberon and Queen Titania live. The first starting player race to reach the top of the World Tree and meet Oberon in this city is said to be reborn as the legendary true race of fairies, the Alfs, and granted unlimited flight. Reaching the «Floating City» and meeting the King and Queen is the first «Grand quest» in ALfheim Online.

However, after Kirito climbs up the World Tree, he discovers that the city does not actually exist at all, proving to be a lie all along. At the end of the Fairy Dance arc, when ALO is acquired by Ymir, «Yggdrasil City» is founded in the place of the non-existing «Floating City» and becomes the new capital city of ALfheim.

Background
To reach the «Floating City», the player must go through a dome at the base of the tree, which is guarded by MC guardians.