File:Vol 03 - 008.png

Summary
The World Tree.

A coloured illustration on page 8 of Sword Art Online Volume 03.

Latest image source: Ruranobe

Original image source: Gsimenas

Sword Art Online Volume 03, Yen Press release

 * World Tree: The final destination of all players in ALfheim Online

The first fairy race to reach the legendary floating city atop the massive World Tree and have an audience with the Fairy King Oberon will be reborn as true fairies known as "alfs." Alfs are no longer subject to the gamer's restrictions on flight, meaning they can fly an infinite distance—the true rulers of the endless expanse of sky. The floating city is reached through the dome at the foot of the World Tree, but the dome's entrance is protected by impossibly powerful guards. In a year of game time, no player has succeeded in that quest as of yet.

Alternative translation
Yggdrasil; The destination of all players who log in to «ALfheim Online».

The tribe who reaches the legendary floating city above «Yggdrasil» and has an audience with the «Fairy King Oberon», who lives there, is able to be reborn as a high-class race, the «Alf». By being reborn into true fairies, the «Alf», the hover limit imposed on the system is eliminated and unlimited flight is possible. And along with it, they are capable to become the rulers of this infinite sky. It's possible to enter this floating city through a dome at the root of «Yggdrasil». However, guardian knights who boast of overwhelming strength guard the entrance. One year has passed since the opening of «ALO», and that quest has yet to be cleared.