The Song-Tseng Nation is an interstellar nation originating in the Song-Teng System and a leading member of the Inter-Stellar Defense Treaty Alliance. It is one of the few nations with Armored Mobile Frames. They had nearly rebuilt Mythril Drive technology from the ground up when they were encountered by the Federation Exploratory Fleets, and remain able to go toe to toe with both major factions' fleet in a fair fight. They have taken to selling their Mythril to mining companies while quickly cementing their own power. The capital planet is Angreboda.

ROZUM appears to be operating against them.