Across the Lord of Mysteries series, Roselle's Diary evolves from a scattered collection of yellowed pages into a pivotal artifact that bridges the mundane and the mystical. Initially appearing in Volume 2 as loose manuscripts conjured for the Tarot Club, these diary entries gradually reveal Emperor Roselle's intimate thoughts, Beyonder secrets, and humorous observations that become essential clues for unraveling the world's hidden history. The diary's significance deepens as its contents are transcribed, analyzed, and weaponized by various factions, transforming it from mere historical curiosity into a catalyst for major plot developments and character revelations.

Across the Lord of Mysteries series, Roselle's Diary evolves from a scattered collection of yellowed pages into a pivotal artifact that bridges the mundane and the mystical. Initially appearing in Volume 2 as loose manuscripts conjured for the Tarot Club, these diary entries gradually reveal Emperor Roselle's intimate thoughts, Beyonder secrets, and humorous observations that become essential clues for unraveling the world's hidden history. The diary's significance deepens as its contents are transcribed, analyzed, and weaponized by various factions, transforming it from mere historical curiosity into a catalyst for major plot developments and character revelations.