The Firmament reigned over the 10,000 Dawns. They broke the Christmas Needle Agreement so Chris Cwej's Superiors, who thought of them as an inferior race, sent Chris as an agent to the Dawns to retaliate.
Behind the scenes
The Firmament originated from the 10,000 Dawns series (with a possibly coincidental) reference to it from PROSE: Introduction and links, which predated 10,000 Dawns by years) and also appeared in multiple crossovers the series had with the Doctor Who universe, none of which are currently considered valid sources by this wiki.
Depiction in the crossovers
The Firmament were turned to fiction by Auteur and later saved from it by Graelyn Scythes. Representatives of the Firmament attended the Christmas Needle Agreement and argued with ambassadors of the Bookkeepers. (NOTVALID: White Canvas)