I Was Reincarnated as the 7th Prince so I Can Take My Time Perfecting My Magical Ability, Volume 7 (I Was Reincarnated as the 7th Prince so I Can Take My Time Perfecting My Magical Ability #57-65)

Prince Lloyd heads deep into the city sewers to clear out a ghoul infestation and test out his shiny new spells. But one of the ghouls possesses the ability to bend everyone under its will. Lloyd thinks he's found another specimen for his experiments - but it turns out to be a clue that will lead him and his friends deep into a treacherous conspiracy...