The Dungeon of 99.999 Levels

What people call a dungeon is, in reality, something way beyond their imagination... Alongside the birth of a new world, the largest dungeon of the universe appeared, and it began to grow endlessly. Those who entered the dungeon never managed to leave until, after thousands of years, someone calling himself dragon god reached the deepest part of the dungeon. "Reach the final floor and obtain everything you want," The dragon god said. A challenge wasn't the only thing that the dragon god left before disappearing... he also left a curse. Every year, ten thousand people had to enter the dungeon. If that number isn't met, then their curse will select those who had to enter, and those who refuse it will have their families killed. First his father, then his mother, and then his elder sister... Zane lost all his family, selected by the curse of the dragon god and the dungeon. When he came of age, even without being selected, he departed to the dungeon with a single goal in mind... destroy the dungeon and kill the dragon god.