Getting into the night dungeon is a little confusing at first, especially for players who breeze through contents or bypass all dialogues without reading them thoroughly. The party has to defend the Mirage against a corrupted division of the 'Shadowless' which is out to forcibly acquire Yehara's collection of Naryu relics, in her absence. The night version, though, is a questing dungeon where only a party of maximum six players are allowed to enter. But it can be simultaneously accessed by all players, after their initial visit (where the player witness Soha and Juwol making a mess in the inn 😅 ), and act very much like any other town. The day version of Yehara Mirage is actually an enclosed dungeon in itself. Yehara is also part of the ' Ashes in the Fall' storyline which rewards the outfit with the same name.
Yehara established the Mirage right in the middle of the desert so she can more easily obtain information and learn the secrets left behind by the Naryu (with regards to Mushin), in order to find her missing niece. Yehara's Mirage is an inn run by the gracious hostess Yehara, aunt to Yunwa - the last of Mushin's bloodline.