The Obsidian Order's Headquarters was the central installation of the Obsidian Order on Cardassia Prime.

In 2371, Legate Tekeny Ghemor believed that Corbin Entek, an Obsidian Order operative, would never be satisfied until he broke Iliana Ghemor – a surgically-altered Kira Nerys. As he could not break her at Ghemor's residence, Entek might take her to the headquarters. Tekeny feared this eventuality and wanted to get Iliana off Cardassia. (DS9: "Second Skin")

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