Duomo di Sirio ("Cathedral of Sirius" in Italian) is a stage in the home release versions of Tekken 7. A grand hall in European stylings that serves as the headquarters of Claudio Serafino's organization, the "Archers of Sirius". Ornate statues adorn the walls and the floor is a polished marble. The battle starts atop the upper deck and the barrier opposite the goddess statue can be broken to take the fight down the lower level.
- Originally the stage had a different main and climax theme (the main theme being the same theme used for Nina Williams's Fated Retribution trailer) but this was changed following the preview build that included Eddy Gordo and Kuma/Panda. The original main theme is still within the PlayStation 4's "Tekken Jukebox" soundtrack under the name "Hideaway 2nd".
- This stage was present for the following character's endings in the game: Steve, Nina, and Eliza.
- This is the stage where Heihachi Mishima fought against Claudio Serafino in The Mishima Saga.