On the edge of the Uranus Sector, there was a small city by the name of Saraun City. It was a pretty average location with a population of less than one hundred thousand, and the strongest warrior was the Wave Champion, who worked as the City Protector.
In the middle of the city was a massive hotel, mostly empty since Saraun City was not a tourist place. However, an entire fortification lay beneath it, over one thousand meters underground.
It was not very large, less than 1/100th of the city, but it was not a problem since it was not a residence but one of the main secret forts of Dead Ocean.
Over a hundred Wave Champions and nearly ten Wave Kings were in the fort. They were all drinking and eating, as it seemed like a party, but aside from the festive aura, they all exuded a potent killing aura.