The Delegation of Thirteen was a group of 13 envoys affiliated with the Grand Alliance who travelled to the Khitan Khanate after the First Battle of Maar Sul. The delegation was led by Sen Wisteria whose objective was to form an alliance between the Khitans and the Grand Alliance in order to liberate Maar Sul from the forces of Yamato and the Clergy of Mardük. Many of the delegates died when marauders led by Glaurung Losstarot attacked the Khitan encampment, but the envoys' heroic sacrifice convinced the Khitans and Qishou Khan's son Alghu Khan to accept Sen's proposal to join the Alliance and fight by their side in the Great War against Yamato.