The Masque of the Night Empress

The Masque of the Night Empress is an opera.

Details
The Vermilion Opera performed The Masque of the Night Empress to celebrate the marriage of Prince Orchenis Clunethar and Uleviän Clunetharan, prior to the crash of the Wisdom of Choharo. Arveneän Shelsin seemingly performed in it, and stole "a midnight-blue dress made of velvet and layer after layer of gauze dyed to match", which was one of the opera's costumes.