On South City's outskirts lay an aerial chain of islands formed by Sky Islands. Many years ago, when the country was still in the midst of civil war, the South City island chain formed an aerial city wall. Below it stood broad walls, watchtowers, and a line of beacon towers. It had once held out for sixteen years against a nationwide siege before being peacefully liberated.
Of course, bringing this up inevitably led to another topic.
—Paris had a greater density of high-ranking witches, more powerful ones, complete mountain-and-river defensive lines, and tower-line fortifications cultivated over a full century. So how had it been so thoroughly overrun, with blood staining the Rhine estuary?
After the War of Unification, South City's chain of Sky Islands became the cloud river surrounding the city, while the walls were turned into terraced fields. Sky Island: Mist Sea Pass, which had served as the core command center of South City's outer defenses, also became a leisure and entertainment center. Under the command of a witch once known as the "City Defender," cloud rivers leading to every Sky Island in the chain and an enormous lake among the clouds had been built directly before Mist Sea Pass, linking it to the island chain.
As the saying went, one could travel to dozens of Sky Islands from here—but if one wished to breach the outer city's island-chain defenses, one had to break through Mist Sea Pass first.
This also made Mist Sea Pass the Sky Island with the most developed transportation after the War of Unification.
On this floating island, which covered 140 square kilometers, the witches had built world-famous golf courses, squash courts, and the Hot Spring Valley scenic area. Hot springs gushed from the valley walls, blending seamlessly with the mountain scenery to form the