Due to the experiments with the Magic Gate, the magical materials in Flame Town were almost depleted, and replenishments were desperately needed from the Flame Territory.
After delegating tasks, Liszt and Ach headed back to Black Horse Island. Although Ach could switch to some forms of a Space Elemental Incarnation, he had not formally developed this ability. Therefore, riding the Formless Dragon still did not enable him to be enveloped by space magic power, preventing him from traversing the Great Whirlpool alongside Liszt.
Thus, they still opted to first ride the dragon to the coast, then switch to Ach's shell.
Of course, first, they rode the Formless Dragon to the Endless Volcano Cluster to find Leo.
Next, they rode on Leo toward the sea—since, as a Dragon Knight without a dragon in attendance, one's combat prowess would dramatically decline, making any encounter with danger quite troublesome.