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Tuatha De Danann (トゥアハ・デ・ダナーン), also known as the Empyreal Fortress (幻想機動要塞), is a flying fortress used by the Kinship of the Earth during their war against the Kinship of the Blaze prior to the Great Collapse. It is said to be their ultimate creation.[1]


Tuatha De Danann disappeared as it was caught in the space-time disruption at the end of the clash between Ark Rouge and Lost Zem when the Great One came into existence.[1]

The Black Workshop has spent the past thousand years renovating it in preparation for its use during Operation Jormungand.[1] It serves as the stage for the last Rivalry.[1]

When it appeared above Osgiliath Basin on 30 August, S.1206, it was accompanied by five 'pales' referred to as Salt Pales. It is speculated that the residues remaining in the earth were used to fortify the construction.[1]

The party consisting of Class VII (Old and New) faced several roadblocks throughout their incursion into the fortress. They included, in order:

  • McBurn in his true, otherworldly king form

Afterwards, Class VII teamed up with all five of the teams dispatched to the Salt Pales to defeat Ishmelga in it's true form and bring the curse of Erebonia to the end.



  • Tuatha Dé Danann are a supernatural race in Irish mythology. Family members of the Tuatha Dé Danann include Lug, reminiscent of the geologist persona's name Black Alberich assumed in Trails of Cold Steel III, and Balor, referring to Black Alberich's combat shell, Zoa Balor.


  1. 1.0 1.1 1.2 1.3 1.4 Trails of Cold Steel IV, Act 3: "Seekers of the Dawn", 08/30. Cite error: Invalid <ref> tag; name "Sen4-060830" defined multiple times with different content
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