The group didn't immediately leave the city. Noah and the others had to seize the various rewards requested for the mission against the ghosts. They even had to spend some time with those materials and prepare a tactic against that unknown enemy.
Maps of the stormy regions were almost impossible to create since the chaotic laws constantly transformed the lands. Only the dead zones remained the same, even if they moved from time to time due to the changes that involved their surroundings.
The group let the old Heaven and Earth create a tracker that could lead them to the ghosts and back to the city, but that was the best they could do.
'I finally understand,' Noah laughed in his mind as he browsed through chunks of fur featuring Kesier runes. 'I still don't know everything, but I understand.'