"Silt Sea Threnody" represented a song of mourning and lament for Nacronis, a planet characterized by its marshland environments and notorious siltstorms, and served as a burial rite. Following the Galactic Empire's act of destruction_of_nacronis against Nacronis during Operation: Cinder, "Silt Sea Threnody" came to be viewed as a native melody originating from a vanished culture.
The initial reference to "Silt Sea Threnody" occurred in the 2021 book Victory's Price: An Alphabet Squadron Novel, penned by Alexander Freed; it functioned as the title for the second chapter. A recurring theme in the novel's initial section involves chapter titles that are presented as "indigenous songs of lost civilizations." Coincidentally, the chapter titled "Silt Sea Threnody" signifies the introduction of Yrica Quell to the narrative. Quell's involvement in the annihilation of Nacronis predates the events of Alphabet Squadron, making her complicit in the transformation of Nacronis into a "lost civilization."