The Sil’dihn Subterrane variant dungeon in Final Fantasy XIV: Endwalker is accessible during a blue quest called A Key to the Past.
One of the highly anticipated key features of Patch 6.25 in Final Fantasy XIV is the introduction of The Sil’dihn Subterrane, the first Variant Dungeon. For those unfamiliar with variant Dungeons, here are Quests containing branching paths that reveal new elements of the Dungeon’s overarching story. Typically, Dungeons in Final Fantasy XIV are linear, one-dimensional instances filled with enemy corridors and arenas. However, the Sil’dihn Underground Variant Dungeon in FFXIV provides a new experience and story content each time the player replays the version. It sounds similar to a roguelike mechanic, but all branching paths are fixed and not randomly generated.
However, The Sil’dihn Subterrane of Patch 6.25 in Final Fantasy XIV cannot be accessed in the first place for Warriors of Light. Like most new content released so far, the player must own and complete the entire Endwalker expansion to accept the prerequisite quest to unlock the Variant Dungeon. Once this feat has been accomplished, they can go to Old Sharlayan and talk to an NPC named Osmon at The Peristyle. His post can be found in Scholar’s Harbor at coordinates (X: 12, Y: 13.4).
Talking to Osmon will initiate the blue quest, “An Odd Job”, in which the player will meet another NPC from Final Fantasy XIV: Endwalker named Shallow Moor. After a large amount of dialogue, the player automatically receives the following quest, “A Key to the Past”, which is a prerequisite for unlocking The Sil’dihn Subterrane in Final Fantasy XIV.
After starting “A Key to the Past”, Final Fantasy XIV fans must head to Ul’dah – Steps of Nald to meet a Lalafell named Kokoshu at (X: 12.5, Y: 8.3). She will reveal that the character that really wants to see the player’s protagonist is not her but the Sultana herself, Nanamo Ul Namo. However, to avoid suspicion, she would approach players disguised as a normal citizen without wearing royal attire. After a few more dialogues, she will send the Warriors of Light to the Sil’dih excavation site in Central Thanalan at (X: 16.9, Y: 23.7).
Finally, players will be able to enter The Sil’dihn Subterrane by talking to the Sil’dihn Subterrane Foreman standing outside the entrance of the Variant Dungeon in Final Fantasy XIV. Deleting this case did not complete the mission, however, as the participants still had to return to Kokoshu in Ul’dah and Shallow Moor in Old Sharlayan to relay their findings. After completing the quest, the player can visit The Sil’dihn Subterrane anytime they want.