Cass has spent years insisting she is definitely not a dungeon boss.

The System disagrees.

In the third and final book of Definitely Not a Dungeon Boss, Cassidy is pulled far beyond Brightfall. Monster disputes become regional problems, dungeons begin moving where they shouldn't, the war against the Abyssal Host reaches Greywatch, and Cass discovers that being powerful enough to protect everyone doesn't mean she has to do everything herself.

Along the way there are argumentative monsters, expensive regional travel, an opinionated ridge drake, airships that prove they are absolutely not tactical, raid groups that refuse to cooperate, a household that keeps getting larger, and one increasingly serious question:

What happens when Heartpiercer finally reaches the end of the progression she has been chasing since the beginning?