A massive generation ship commissioned by the Mormon Church, built at Tycho Station under Fred Johnson's supervision, intended to carry colonists on a centuries-long journey to a nearby star system. Before completion, the Nauvoo is commandeered and launched at Eros in a desperate attempt to push the infected station into the sun - a plan that fails when Eros dodges. The ship is later recovered, renamed the Behemoth, and converted into a military vessel. It eventually becomes Medina Station, the permanent hub inside the ring space that controls access to the gate network.