Sed Uth is Draconic for Three Orders, the name of three Kriistvrii armies that served under Bahamut in the First Dragon Wake (218 GE - 235 GE) and the other mini-wars of the Demon Spawn War.
Six years after the First Dragon Wake, Bahamut departed for Mertion, his newfound divine domain. Following their leader's exit, the Sed Uth soldiers pressed onward in the war against the demons as part of the Covenant command framework; unlike Bahamut, they regarded the diverse peoples serving in the Covenant as comrades-in-arms.