- Not to be confused with the hidden dungeon that appeared in the series' game adaption.
The entrance to this dungeon is located outside the Black Iron Palace and, accessed through an underground water supply. The dungeon has a notably high level difficulty, despite being on the 1st Floor. The dungeon's walls are made of black stones and lined with columns. A safe area lies at the end of this dungeon, which is guarded by The Fatal Scythe.
The Safe Area is a completely white room with smooth walls and floor. A black cube, a Game Master (GM) console, is placed in the middle of the room.
When the boss appears, the surrounding area turns into a shade of violet blue, and some of the stone walls are given a new graphic as well.
- Safe Area
- The Fatal Scythe's Boss Corridor
Kibaou used this dungeon to trap Thinker when the latter was considering of discharging him from the guild for getting his men killed by The Gleam Eyes on the 74th Floor. Thinker was trapped for three days until Yulier finds Kirito and Asuna to help her. Yui demanded to come along as well, and the group reluctantly agreed.
Kirito easily sliced through the dungeon’s monsters and they soon saw the safe area where Thinker was being held. Yulier ran towards the safe area, and Kirito barely managed to knock Yulier aside to prevent her from being hit by The Fatal Scythe. Kirito prompted Yulier to retreat to the safe area with Yui as he confronted the boss. Seeing that the boss has too high of a level to identify, Kirito soon told Asuna to leave as well. Asuna disagreed and fights alongside Kirito. The Fatal Scythe knocked both high-leveled players down, taking away about half of their HP along with it.
Yui steps out from the safe area as Thinker and Yulier teleport away. The Fatal Scythe detects Yui and attacks her, but is stopped by her «Immortal Object» status. Yui then uses the GM console's «Object Eraser» function, in the form of a large sword, and easily defeats the boss. She then turns to her "parents" and tells them that she remembered everything.
In the safe area, Yui explains that she regained her memories after touching the GM console when Yulier first brought her inside. Yui also says that she wishes to be with them forever, but will be shortly deleted from the system as a foreign object. Kirito intervenes and uses the still-active Admin access and his computer skills to retrieve Yui and save her as an in-game item, «Yui’s Heart», as part of his NerveGear’s environment data.
- The dungeon was not available in the beta version of Sword Art Online.
- The dungeon only becomes accessible after a certain condition on the higher floors is fulfilled.
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