Dungeons of the Gods: Main Character Hides His Strength, Book 5

The next prophesied Calamity was one of Civil War. Even without the presence of seditious groups such as the Order of Extinction and the Followers of Calamities undermining the unity of the world, the many disparate Kingdoms were barely cooperative at best. Meanwhile, Sungchul becomes increasingly exposed to the legends of the ancient dungeons hidden away by the Lesser Gods, which held the key to immortality. With the many factions hell-bent on power, it seems all but inevitable that these long-forgotten Dungeons of the Gods return to the forefront of the world.