After devouring all the souls on the mountain range, Su Mo's Martial Soul was elevated to Rank 9 Heaven Class. He immediately departed from the mountain range.
Instead of continuing to devour more souls on the way, he flew straight to Tushan Town.
He intended to return to the Firmament Palace to have a look. First, he wanted to send Feng Shaoyu, Jun Wuxi and the others to the Firmament Palace. Second, he wished to concentrate the power of the suzerain from the Firmament Palace so that he could speed up the process of hunting and killing demonic beasts and getting hold of their Beast Souls.
Moreover, it would not take too much time for him to return to the Firmament Palace. While he traveled, he could actually use his time to explore and study the Ultimacy.
Su Mo had headed in the direction of Tushan Town when he departed from Shenwu Academy. By now, he was only two days' journey away from Tushan Town.