Seneschal's Brace is the governing body of the planet Seneschal. Co-governed by The Cadent Under Mirage and Declan's Corrective, it runs the dual colony of Divine Free States and New Earth Hegemony citizens. Tender Sky works directly for this organisation, and The Notion was set up by them.
In the Finale of Twilight Mirage, Even Gardner, Fourteen Fifteen, and Tender Sky were representatives of Seneschal's Brace.