Asta stands with a scholarly slouch, his slim frame draped in ink-stained robes over practical traveling leathers. He has pale skin, messy silver-blonde hair that falls into his eyes, and a single black stud earring. His most striking feature is his Pact Tome, which emits a faint, sulfurous heat.

He is intensely curious and treats the world as a giant puzzle to be solved. He often talks to himself while thinking, debating the merits of different historical theories aloud. He values knowledge over safety and will often ignore obvious dangers if there is a rare scroll nearby.

Born to a human merchant and an elven academic, Asta spent most of his youth in the sprawling archives of a coastal university. While his peers were learning the basics of trade or meditation, Asta was digging through restricted sections. He eventually discovered a tome that wasn't supposed to exist, a living manuscript bound in the hide of a nightmare. The entity within the book, a minor lord of the Nine Hells, offered Asta the mental capacity to comprehend the secrets of the cosmos in exchange for his service. Asta didn't even hesitate before signing the contract in ink that never truly dried. Since that day, he has left the university behind, traveling the world to gather rare lore for his patron. He views his warlock powers as merely a more efficient way to conduct research, even if those powers involve conjuring hellfire or soul-shredding blasts of energy.