The Low Life Lot

From the introduction

Since before you can remember, it’s been like this. You’re a Lowlifer, living in the dregs of Utopia. They are the Highlifers, living in their buildings that graze the clouds. The distinction has been clear since way back when; They Are Important, You Are Not. They enact and enforce the laws, they make all the money, they decide who excels and who suffers. ...
Eventually, however, Lowlifers come to the end of their ropes, and they only have one choice: enter the Dungeon. Slay the creatures within, collect their wealth, strip the bones of those who came before, and emerge, battered but not beaten, to live and eat another day.