File:Progressive Vol 2 - 008.png

Summary
Coloured illustration on page 8 of Sword Art Online Progressive Volume 02

Latest image source: Ruranobe

Second image Source: Personal Scans by 1caiser

Original image source: http://lknovel.lightnovel.cn/main/view/38515.html

Sword Art Online Progressive Volume 02, Yen Press release
Floating Castle Aincrad, Floor Data: 3rd Floor

The design theme of this floor is "forest". Unlike the woods near Horunka on the first floor or the southern area of the second floor, the third floor is covered entirely by enormous ancient trees. The southern area of this floor is called the Forest of Wavering Mists, a baffling place choked with thick fog. The main city of the third floor, Zumfut, is built inside gigantic hollowed-out trees. There is a dark elf stronghold at the south end of the forest and a forest elf stronghold at the north end. These act as the bases for each side of the campaign quest. The bases have tents for sleeping, eating and even bathing, so players in the midst of the quest have no need to return to town. A field boss guards the tiny pass between the mountains, beyond which is the northern area of of the floor and the labyrinth tower.

The boss of the third floor is Nerius the Evil Treant. Nerius takes the form of a giant walking tree, and like Illfang the Kobold Lord and King Asterios, it's attack patterns have been changed from the beta test.

Alternative translation
All of the «Forest of Wavering Mist».

Floating Castle Aincrad, Information of each floor.

3rd Floor

Design Theme is «Forest». However, unlike the scale of forest in Horunka Village surrounding on Floor 1 or forest in Southern region of Floor 2, the whole floor is covered by giant ancient trees. The southern part of the Floor is called as «Forest of Wavering Mist», is covered with heavy mist that could let player feel dizzy. Main street area «ズムフト» is at the southwest of the floor, and there're 3 giant tree which grow close to each other. Southern part and northern part of the forest would have Dark Elf and Forest Elf's campsite respectively, and they're the base of the first campaign quest in SAO. In the campsite, there're camps for residence, canteen and bath, players does not need to go back to street area when mission in progress. To access the dungeon area within the northern part of the floor, players need to beaten the wild boss which construct its nest in the only valley of the central mountain range.

Third Floor Boss is «Nerius The Evil Treant». This giant tree-shaped monster seem to have different attack mode from beta test age as like Illfang the Kobold Lord from the first floor and Asterios The Taurus King from the second floor.