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It is said that the trials in the Frost Tower are so complex that many people have failed constantly, even after many tries. Because of this, and the dangerousness of the sea, many of those that tried it and failed decided to go back to the mainland and gave the trial and the island a bad reputation. Over time, the adventurers that came to explore this place became lesser and lesser. However, there was a group of people that decided to stay in here instead of going back to the mainland, a brave group of people that slowly built their own town around here, fought these enormously strong beasts, consumed the plants and fruits growing here alongside the meat of these monsters, and cultivated the rich surrounding energies. It wouldn't be a stretch to say that these people… might be extremely strong.
Check "The Protagnist's Sister Is Actually the Strongest"!