Dataminers on the Suikosource forums discovered an unused dungeon in the game that cannot be accessed other than through hacking. The dungeon is incomplete with some missing features, but is largely playable. While there is no direct confirmation from developers on how it was intended to tie in with the game's narrative, dataminers have concluded the following:

At some point after defeating the Beast Rune, the player is supposed to return to the village of Sajah. There is an inconspicuous-looking rock that does nothing, but which can be removed via hacking to reveal an entrance. While this entrance does not work, it is theorized that once entering this passage, the player would reach the lowest floor of the test dungeon. From there they would travel upward and face six or more bosses (speculated to be Bone Dragon, Stone Golem, Abomination, Double Head, Pest Rat and Harpy - though not necessarily in that order) gatekeeping certain stairs. Monsters would get progressively harder at each stage. There are around six floors and 8 orbs which the player would need to collect to pass through the final door.

In the final room, there is a purple rune that offers 3 choices; When the dialogue is translated into English, it reads:


Looking through all of this dialogue, the first option warps you back to Sajah, leaving you on your way. The second option allows you to step back before deciding again, while the third option warps you to an unknown location.

It is theorized you're supposed to end up in Sindar Ruin as there was a brief moment where Riou was left alone. In the end, you get to replay at that point in time, with previously kept items/stats, and possibly have the combined Rune of Beginning (Sword and Shield Rune) as it has been alluded many times in-game that it was considered as one.

It's speculated the reason why this dungeon was scrapped was because it was too ambitious to be implemented.

To explore on your own (for the North American version) use the following GameShark code to teleport Viki to an Unknown Dungeon (Pick Kazah Village [note: Sajah Village was originally named Kazah Village]):

8006AEAA 0080
D015DC50 E1C4
3015F53D 0009
D015DC50 E1C4
3015F53E 0011