Noah and the others left the domes and blue lands right away. They were already late, but they didn't care about that issue. They simply couldn't wait to start the mission and explore the other side of the Immortal Lands.
King Elbas, Wilfred, Divine Demon, Fergie, Luke, Noah, and the Foolery left and flew across countless regions to reach their destination. They could teleport, but they didn't trust the human forces enough to go there without inspecting the environment.
Noah also wanted to fly across the sky to let Heaven and Earth's pressure improve his mind. Devouring Alexander's ethereal creatures had made his mental sphere quite frail, and Noah wanted to get rid of that flaw right away.
The human forces waited patiently for the experts' arrival. Noah's evaluation had been on point. Those organizations were quite desperate for the Legion's help in the mission.